Subs.. I would say yes..

Why, you ask? Because probably the MOST seasick I've ever been was on two different dives, maybe 80 feet deep.. there was a LOT of "surge" which is a current that takes you 15 feet, or so one direction, then takes you back 15 feet the opposite direction.. over and over.. I got soooooooo freaking sick.. so, depends on the motion of the ocean, and that motion also happens at depth..

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Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..