5 ms·I wondered that too. I think the sandwiches were inside the sub, which was still full of air?by jrmg 4y agoI wondered that too. I think the sandwiches were inside the sub, which was still full of air?can16358p 4y agoThen how did they observe the effect of being down underwater? I mean it's a normal sea-level environment inside the sub, not much different from inside an office building with windows closed.jrmg 4y agoIt would still be high pressure, just high pressure air.