The more important question is, is it possible to get an upside down boat at that depth and hold it there with only your body weight? Unfortunately, no you can't. Mythbusters tested it and found that the buoyancy was too much.
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To actually answer your question, I think yes. I seem to recall that they also did a volume calculation and found that there was sufficient air for a few minutes.
*I think, not sure.
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Remember kids, don't try this at home.
Do it at your freinds house.
not to ruin your enthusiasm, but the water would inside the boat..... as for the cup, it was possible because not fully immersed inside. if you push it so the water is over the top of the cup there is no air left. which should be the same thing for the scene
Um... if you push a bucket under water upside-down, air will remain trapped in the bucket. It doesn't magically dissappear or float through the bucket to the surface.
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To actually answer your question, I think yes. I seem to recall that they also did a volume calculation and found that there was sufficient air for a few minutes.
*I think, not sure.
.
Remember kids, don't try this at home.
Do it at your freinds house.