Going out to drink in a nutshell

actually i dont believe you the upwards force from the air would to to much to pull down ( especially in a pool ) http://www.discovery.com/tv-shows/mythbusters/mythbusters-database/use-a-capsized-boat-as-a-submarine/

I can assure you, this is possible. I can't say it would work with a boat in a large ocean but it worked for me.

What ever you say man... i dont want to argue im just stating my opinion.

I'm not gonna argue, I was just sharing my experience.