英國天文學家Edmund Halley提議地球由四個同心圓組成(網路圖片)
飛碟研究專家們認為，飛碟的來源大致可分為三類：外太空、內太空、未來的人形生物通過時光隧道「來訪」。而所謂的內太空即指地球本身，從地心至大氣層均有可能。美國普林斯頓大學教授波爾·施泰恩加德(Paul Steinhardt)和英國劍橋大學教授尼爾·圖洛克(Neil Turok)兩位理論物理學家提出了宇宙輪迴理論，認為宇宙大爆炸發生了不止一次，宇宙一直經歷著「生死輪迴」的過程，而我們所認為的140億年前的宇宙大爆炸，並非宇宙誕生的絕對起點，那只是宇宙的一次新生、一個環節而已。新的理論認為這兩個宇宙最終將相撞，而產生又一次的大爆炸。圖洛克教授說，「現在正在發生的事將會在未來重現，宇宙是無限的輪迴。」
飛碟研究專家們認為，宇宙中許多高度進化的文明都轉移到地下世界去了。住在地心世界有許多好處，如陽光中的有害射線和宇宙中其它有害射線都到達不了地下；無論是隕石、暴風雨、冰雹或颶風也無法入侵；可以在小范圍內自動調節氣候，建立完善的生態系統，充滿空氣、水和光；可以避免蚊蟲的騷擾，以及對這個生態系統不宜的物種；不會引起不發達星球的注意，他們不會意識到在一個地表是死氣沉沉而乾燥無比的星球內部竟然會有非常發達的文明；生活在星球內部，也是一種心態的反映，不會只重視外表，不關注內在。這些地下世界的居民比地麵人類科技先進得多。有些UFO不是來自其它行星，而是地球內部生命所製造。
在17世紀晚期，英國天文學家Edmund Halley提議地球由四個同心圓組成而「暗示地球內部居住有生命和靠發光的大氣層照明。他認為極光或北極光由這些逃逸出來的氣體通過位於極地的薄地殼引起。」1812年一位行為古怪的老兵John Symmes廣泛地發揚了內部同心球體的想法，聲稱通向內部世界的開口就叫做「Symmes洞」。1869年，賽勒斯·裡德·Teed，一位草藥醫生和自稱的煉金術士，有一個女人夢見告訴他我們是生活在空心地球內部。差不多過了50年，Teed用小冊子和演講宣稱其思想。1906年，威廉·裡德發表了極的幻影，在書裡他聲稱無人能發現北極和南極，因為它們不存在。相反兩極是進入空心地球的入口。在1913年，馬歇爾·B·加德納私下地發表了到地球內部的旅行，在書裡他不認可同心球體的想法只是發誓空心地球內是直徑600英里的太陽。加德納也聲稱在兩極有一千英里寬的洞。
拜爾德Richard Evelyn Byrd, Jr於1888年10月25日出生在一個美國弗吉尼亞州的顯赫家族，父兄都是美國聯邦或州府參議員，於1957年3月11日去世。拜爾德是20世紀美國家喻戶曉的探險英雄，被授予美國海軍少將，他於1919年成功飛越大西洋，1926年成功飛越北極。1947年3月5日- 拜爾德在USS奧林匹斯山探險船上，接受了國際新聞社的李·範·阿塔的採訪，發表在智利信使報上：「今天海軍少將理查拜爾德警告說，美國應採取保護措施，應對從極地地區入侵的敵對飛機。拜爾德解釋說，他並不想嚇唬人，但殘酷現實情況是，如果新的戰爭開始，美國會受到來自飛越南北兩極的敵機的攻擊。」（「Admiral Richard E. Byrd warned today that the United States should adopt measures of protection against the possibility of an invasion of the country by hostile planes coming from the polar regions. The admiral explained that he was not trying to scare anyone, but the cruel reality is that in case of a new war, the United States could be attacked by planes flying over one or both poles.」）（圖1）這裡「來自飛越南北兩極的敵機」到底是指前蘇聯的飛機，還是納粹德國殘餘在極地基地的飛機，還是來自地心世界的飛碟？
網傳1947年2月19日拜爾德少將和幾名軍人組成探險隊前往北極進行探險，去北極探險結束後寫下下段日記。這就是著名的拜爾德日記，但是否由拜爾德本人親自撰寫，受到很多飛碟研究專家的質疑，尚需進一步確證。
日記的英文原文（http://www.bibliotecapleyades.net/tierra_hueca/esp_tierra_hueca_2d.htm）
「
The exploration flight over the North Pole
I must write this diary in secrecy and obscurity. It concerns my Arctic flight of the nineteenth day of February in the year of Nineteen and Forty Seven.There comes a time when the rationality of men must fade into insignificance and one must accept the inevitability of the Truth!I am not at liberty to disclose the following documentation at this writing... perhaps it shall never see the light of public scrutiny, but I must do my duty and record here for all to read one day.In a world of greed and exploitation of certain of mankind can no longer suppress that which is truth.
FLIGHT LOG - BASE CAMP ARCTIC - 2/19/1947
0600 Hours- All preparations are complete for our flight north ward and we are airborne with full fuel tanks at 0610 Hours.
0620 Hours- fuel mixture on starboard engine seems too rich, adjustment made and Pratt Whittneys are running smoothly.
0730 Hours- Radio Check with base camp. All is well and radio reception is normal.
0740 Hours- Note slight oil leak in starboard engine, oil pres sure indicator seems normal, however.
0800 Hours- Slight turbulence noted from easterly direction at altitude of 2321 feet, correction to 1700 feet, no further turbulence, but tail wind increases, slight adjustment in throttle controls, aircraft performing very well now.
0815 Hours- Radio Check with base camp, situation normal.
0830 Hours- Turbulence encountered again, increase altitude to 2900 feet, smooth flight conditions again.
0910 Hours- Vast Ice and snow below, note coloration of yellowish nature, and disperse in a linear pattern. Altering course foe a better examination of this color pattern below, note reddish or purple color also. Circle this area two full turns and return to assigned compass heading. Position check made again to base camp, and relay information concerning colorations in the Ice and snow below.
0910 Hours- Both Magnetic and Gyro compasses beginning to gyrate and wobble, we are unable to hold our heading by instrumentation. Take bearing with Sun compass, yet all seems well. The controls are seemingly slow to respond and have sluggish quality, but there is no indication of Icing!
0915 Hours- In the distance is what appears to be mountains.
0949 Hours- 29 minutes elapsed flight time from the first sighting of the mountains, it is no illusion. They are mountains and consisting of a small range that I have never seen before!
0955 Hours- Altitude change to 2950 feet, encountering strong turbulence again.
1000 Hours- We are crossing over the small mountain range and still proceeding northward as best as can be ascertained. Beyond the mountain range is what appears to be a valley with a small river or stream running through the center portion. There should be no green valley below! Something is definitely wrong and abnormal here! We should be over Ice and Snow! To the portside are great forests growing on the mountain slopes. Our navigation Instruments are still spinning, the gyroscope is oscillating back and forth!
1005 Hours- I alter altitude to 1400 feet and execute a sharp left turn to better examine the valley below. It is green with either moss or a type of tight knit grass. The Light here seems different. I cannot see the Sun anymore. We make another left turn and we spot what seems to be a large animal of some kind below us. It appears to be an elephant! NO!!! It looks more like a mammoth! This is incredible! Yet, there it is! Decrease altitude to 1000 feet and take binoculars to better examine the animal. It is confirmed - it is definitely a mammoth-like animal! Report this to base camp.
1030 Hours- Encountering more rolling green hills now. The external temperature indicator reads 74 degrees Fahrenheit! Continuing on our heading now. Navigation instruments seem normal now. I am puzzled over their actions. Attempt to contact base camp. Radio is not functioning!
1130 Hours- Countryside below is more level and normal (if I may use that word). Ahead we spot what seems to be a city!!!! This is impossible! Aircraft seems light and oddly buoyant. The controls refuse to respond!! My GOD!!! Off our port and star board wings are a strange type of aircraft. They are closing rapidly alongside! They are disc-shaped and have a radiant quality to them. They are close enough now to see the markings on them. It is a type of Swastika!!! This is fantastic. Where are we! What has happened. I tug at the controls again. They will not respond!!!! We are caught in an invisible vice grip of some type!
1135 Hours- Our radio crackles and a voice comes through in English with what perhaps is a slight Nordic or Germanic accent! The message is:'Welcome, Admiral, to our domain. We shall land you in exactly seven minutes! Relax, Admiral, you are in good hands.'I note the engines of our plane have stopped running! The aircraft is under some strange control and is now turning itself. The controls are useless.
1140 Hours- Another radio message received. We begin the landing process now, and in moments the plane shudders slightly, and begins a descent as though caught in some great unseen elevator! The downward motion is negligible, and we touch down with only a slight jolt!
1145 Hours- I am making a hasty last entry in the flight log. Several men are approaching on foot toward our aircraft. They are tall with blond hair. In the distance is a large shimmering city pulsating with rainbow hues of color. I do not know what is going to happen now, but I see no signs of weapons on those approaching. I hear now a voice ordering me by name to open the cargo door. I comply.
END LOG
From this point I write all the following events here from memory. It defies the imagination and would seem all but madness if it had not happened.The radioman and I are taken from the aircraft and we are received in a most cordial manner. We were then boarded on a small platform-like conveyance with no wheels! It moves us toward the glowing city with great swiftness. As we approach, the city seems to be made of a crystal material.Soon we arrive at a large building that is a type I have never seen before. It appears to be right out of the design board of Frank Lloyd Wright, or perhaps more correctly, out of a Buck Rogers setting!!
We are given some type of warm beverage which tasted like nothing I have ever savored before. It is delicious. After about ten minutes, two of our wondrous appearing hosts come to our quarters and announce that I am to accompany them. I have no choice but to comply. I leave my radioman behind and we walk a short distance and enter into what seems to be an elevator.We descend downward for some moments, the machine stops, and the door lifts silently upward! We then proceed down a long hallway that is lit by a rose-colored light that seems to be emanating from the very walls themselves! One of the beings motions for us to stop before a great door. Over the door is an inscription that I cannot read. The great door slides noiselessly open and I am beckoned to enter.
One of my hosts speaks.'Have no fear, Admiral, you are to have an audience with the Master...'I step inside and my eyes adjust to the beautiful coloration that seems to be filling the room completely.Then I begin to see my surroundings. What greeted my eyes is the most beautiful sight of my entire existence. It is in fact too beautiful and wondrous to describe. It is exquisite and delicate. I do not think there exists a human term that can describe it in any detail with justice!My thoughts are interrupted in a cordial manner by a warm rich voice of melodious quality,'I bid you welcome to our domain, Admiral.'I see a man with delicate features and with the etching of years upon his face. He is seated at a long table. He motions me to sit down in one of the chairs.After I am seated, he places his fingertips together and smiles.He speaks softly again, and conveys the following:'We have let you enter here because you are of noble character and well-known on the Surface World, Admiral.'Surface World, I half-gasp under my breath!'Yes,' the Master replies with a smile, 'you are in the domain of the Arianni, the Inner World of the Earth. We shall not long delay your mission, and you will be safely escorted back to the surface and for a distance beyond. But now, Admiral, I shall tell you why you have been summoned here.Our interest rightly begins just after your race exploded the first atomic bombs over Hiroshima and Nagasaki, Japan. It was at that alarming time we sent our flying machines, the "Flugelrads", to your surface world to investigate what your race had done. That is, of course, past history now, my dear Admiral, but I must continue on. You see, we have never interfered before in your race's wars, and barbarity, but now we must, for you have learned to tamper with a certain power that is not for man, namely, that of atomic energy. Our emissaries have already delivered messages to the powers of your world, and yet they do not heed. Now you have been chosen to be witness here that our world does exist.You see, our Culture and Science is many thousands of years beyond your race, Admiral.'
I interrupted,'But what does this have to do with me, Sir?'The Master's eyes seemed to penetrate deeply into my mind, and after studying me for a few moments he replied,'Your race has now reached the point of no return, for there are those among you who would destroy your very world rather than relinquish their power as they know it...'I nodded, and the Master continued,'In 1945 and afterward, we tried to contact your race, but our efforts were met with hostility, our Flugelrads were fired upon.Yes, even pursued with malice and animosity by your fighter planes. So, now, I say to you, my son, there is a great storm gathering in your world, a black fury that will not spend itself for many years. There will be no answer in your arms, there will be no safety in your science.It may rage on until every flower of your culture is trampled, and all human things are leveled in vast chaos. Your recent war was only a prelude of what is yet to come for your race. We here see it more clearly with each hour.. do you say I am mistaken?''No,' I answer, 'it happened once before, the dark ages came and they lasted for more than five hundred years.''Yes, my son,' replied the Master, 'the dark ages that will come now for your race will cover the Earth like a pall, but I believe that some of your race will live through the storm, beyond that, I cannot say.We see at a great distance a new world stirring from the ruins of your race, seeking its lost and legendary treasures, and they will be here, my son, safe in our keeping. When that time arrives, we shall come forward again to help revive your culture and your race.Perhaps, by then, you will have learned the futility of war and its strife...and after that time, certain of your culture and science will be returned for your race to begin anew. You, my son, are to return to the Surface World with this message.....'
With these closing words, our meeting seemed at an end. I stood for a moment as in a dream....but, yet, I knew this was reality, and for some strange reason I bowed slightly, either out of respect or humility, I do not know which.Suddenly, I was again aware that the two beautiful hosts who had brought me here were again at my side.'This way, Admiral,' motioned one.I turned once more before leaving and looked back toward the Master. A gentle smile was etched on his delicate and ancient face.'Farewell, my son,' he spoke, then he gestured with a lovely, slender hand a motion of peace and our meeting was truly ended.Quickly, we walked back through the great door of the Master's chamber and once again entered into the elevator.The door slid silently downward and we were at once going upward. One of my hosts spoke again, 'We must now make haste, Admiral, as the Master desires to delay you no longer on your scheduled timetable and you must return with his message to your race.'I said nothing. All of this was almost beyond belief, and once again my thoughts were interrupted as we stopped. I entered the room and was again with my radioman. He had an anxious expression on his face.As I approached, I said,'It is all right, Howie, it is all right.'The two beings motioned us toward the awaiting conveyance, we boarded, and soon arrived back at the aircraft. The engines were idling and we boarded immediately.The whole atmosphere seemed charged now with a certain air of urgency. After the cargo door was closed the aircraft was immediately lifted by that unseen force until we reached an altitude of 2700 feet. Two of the aircraft were alongside for some distance guiding us on our return way.I must state here, the airspeed indicator registered no reading, yet we were moving along at a very rapid rate.
215 Hours - A radio message comes through. 'We are leaving you now, Admiral, your controls are free. Auf Wiedersehen!!!!'We watched for a moment as the flugelrads disappeared into the pale blue sky.The aircraft suddenly felt as though caught in a sharp downdraft for a moment. We quickly recovered her control. We do not speak for some time, each man has his thoughts...
ENTRY IN FLIGHT LOG CONTINUES
220 Hours- We are again over vast areas of ice and snow, and approximately 27 minutes from base camp. We radio them, they respond. We report all conditions normal....normal. Base camp expresses relief at our re-established contact.
300 Hours- We land smoothly at base camp. I have a mission.....
END LOG ENTRIES.
March 11, 1947
I have just attended a staff meeting at the Pentagon. I have stated fully my discovery and the message from the Master.All is duly recorded. The President has been advised. I am now detained for several hours (six hours, thirty- nine minutes, to be exact.) I am interviewed intently by Top Security Forces and a medical team. It was an ordeal!!!!I am placed under strict control via the national security provisions of this United States of America. I am ORDERED TO REMAIN SILENT IN REGARD TO ALL THAT I HAVE LEARNED, ON THE BEHALF OF HUMANITY!!! Incredible!I am reminded that I am a military man and I must obey orders.
30/12/56 - FINAL ENTRY
These last few years elapsed since 1947 have not been kind...
I now make my final entry in this singular diary. In closing, I must state that I have faithfully kept this matter secret as directed all these years. It has been completely against my values of moral right. Now, I seem to sense the long night coming on and this secret will not die with me, but as all truth shall, it will triumph and so it shall.This can be the only hope for mankind. I have seen the truth and it has quickened my spirit and has set me free! I have done my duty toward the monstrous military industrial complex.Now, the long night begins to approach, but there shall be no end.Just as the long night of the Arctic ends, the brilliant sunshine of Truth shall come again... and those who are of darkness shall fall in it's Light... FOR I HAVE SEEN THAT LAND BEYOND THE POLE, THAT CENTER OF THE GREAT UNKNOWN.
Admiral Richard E. Byrd
United States Navy
24 December 1956
」
中文相關描述：
拜爾德飛行日記所載，探險隊駐紮在北極地區某一基地內。1947年2月19日，一切準備就緒後，他們朝北方進行飛行探測。圓形六分儀和指南針均經過再三檢驗，無線電通訊也正常。
他們到達飛行高度707米時，東風帶來輕微地震動，下降到518米時，飛機又趨於穩定，但尾風增強，後又產生震動，爬升到610米則又一切平穩。這時，他們看到地面上覆蓋著無盡的冰雪，呈現出微黃色的光澤，但奇怪地分散成直線狀，還略微透出微紅色和紫色。
拜爾德除將此奇景立即電告基地外，又環繞飛行兩圈。這時，他發現指南針和六分儀不停地旋轉抖動，無法測出飛行方向，接著，看到地面不再有冰雪，遠方出現了山脈。那些山脈的範圍並不大，但決不是幻覺。此時已飛行29分鐘。
爬升至900米時，拜爾德的飛機遭遇到強烈地震動。繼續朝北飛越這些山脈後，他竟然看到了春意盎然的山谷，山谷中有小溪流過，左邊的山坡上分布著茂密的森林。此時羅盤又開始旋轉，並在兩點之間來回擺動。於是他下降至427米，向左急轉，以便仔細觀察這個山谷。他看到青苔或稠密的青草覆蓋著的地面，但這裡的光線卻非常奇特，因為並沒有看到陽光。
他還看見了似乎是大象的動物，再下降至305米，在望遠鏡中他吃驚地發現了地球上本已絕種的猛獸！繼而又看到綠色的起伏山丘，外面的溫度為27℃，各種儀器恢復正常，無線電通訊卻失靈了。
地面更趨於平坦，拜爾德發現竟然有城市存在，而空中的飛行器似乎具有神奇的浮力。在艙門上端和右側出現碟形發光飛行器，上面有無法形容的符號。結果，拜爾德的飛機被一股無形的力量所吸住，無法加以控制。
更不可思議的事情隨即發生，無線電發出的嘩嘩聲中竟然傳出帶著北歐語言或德語音調的英語：「歡迎將軍的光臨」，並稱不必擔心，7分鐘之後將安全降落。
接著，飛機的引擎停止運轉，飛機在輕微地震動中平安著陸，好像是由看不見的升降機支撐著。幾位金髮碧眼、皮膚白皙、體形高大的人出現了，這些人並沒有攜帶任何武器。而這座城市閃閃發光，有規律地發出彩虹般的色彩。拜爾德和無線電通訊員受到熱忱地款待，他們登上了沒有輪子的平臺車，急速奔向燦爛的城市。城市似乎是用水晶修筑而成。隨後，他們走進一巨大的建築物裡，飲用風味絕佳的熱飲料。10分鐘後，拜爾德暫時離開通訊員，進入一架升降機，向下運轉數分鐘，後來升降機的門朝上無聲地開啟，他走過充滿玫瑰紅色的走廊，光線似乎是從牆壁上放射出來的。他在一扇巨大的門前停下，門上有奇特的文字。在進入該房間之後所發生的事情更具有震撼性。拜爾德一再使用「前所未有」、「不可思議」、「難以形容」等詞彙來描述他親眼看到的華麗精緻的房間，那些人的聲音既悅耳又熱忱，他們告訴將軍，因他具有高貴的素質，並在「地表」世界有一定的知名度，所以讓他入境。
那些人還告訴他，這個地下世界名為「阿里亞尼」，自從美軍在日本廣島投下兩顆原子彈以後，他們才開始關注外面的世界，並在那個危機四伏的時代，派遣許多飛行器到地表展開調查。他們表示，地下世界的科技和文化要比地上世界進步數千年，原先他們並沒有干涉地上世界的戰爭的想法，但因為不願再見到人類使用原子武器，因此派出密使訪問超級大國，可未受重視。這次借邀請將軍的機會，傳達地上世界可能會走上自我毀滅的信息。那些人抱怨說，他們派出的人在地上世界受到了不友好的待遇，而飛行器也常遭戰機惡意攻擊。人類文明之花慘遭蹂躪，陰暗的幕罩已經降臨，全世界將陷入極度的不安之中。黑暗時代將出現，但新世界將從廢墟中再生，地下世界的人類會協助地上世界的人類重建家園。
拜爾德在結束會晤後，沿原路返回，與滿臉狐疑的通訊員會合。在兩架飛行器的引導下，他們升至823米，然後平安返回基地。臨行之前無線電傳來德語「再見」的聲音，27分鐘後著陸。
1947年2月，拜爾德出席美國國防部的參謀會議，所有的陳述均有詳細記錄，並且向杜魯門總統做了匯報。會議歷時6小時40分鐘，他還接受了最高安全部門及醫療小組的調查，後被有關方面告之嚴守秘密。拜爾德身為軍人，只能服從命令。但他仍在1965年12月24日的日記中寫到：「那塊土地在北極，那個基地是一個巨大的謎。」
