I know that air can be under water if there is something to contain it that prevents its escape. But can a place such as buildings or ancient ruins submerged totally under water hold air pockets as bigger as a room? I recently saw a home-made-video-of-sorts that claimed to have discovered a underwater ruin and showed its interior rooms absolutely devoid of water full of air. Is that even possible, to have an underwater ruin with a room full of air? I mean air has got to escape from somewhere.

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    $\begingroup$ Possible duplicate: physics.stackexchange.com/q/13141/2451 $\endgroup$ – Qmechanic Jul 5 '13 at 20:24
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    $\begingroup$ yeah I have seen this one before posting, however I don't understand how a building or an ancient structure could possibly be air tight at such high pressures under sea $\endgroup$ – Abhilash Jul 5 '13 at 21:25
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    $\begingroup$ In light of the emphasis of long-term stability of air pockets, I suppose this is not a duplicate. That said, it's hard to answer without specifics - what kind of ruin? how old? is it really underwater all the time? $\endgroup$ – user10851 Jul 6 '13 at 0:22
  • $\begingroup$ @ChrisWhite well it's at least 3000 years old ruin which has always been under water for more than 1000 years $\endgroup$ – Abhilash Jul 6 '13 at 5:01