"If a person have not enought weights they cannot go deep because stomach air and others air will push him up and if they empty that the wather pressure will compress him and he does not have air for balance the pressure at all."

Without weights you would certainly burn more energy pushing down to the depth where you reach negative buoyancy, but it's not impossible as you're trying to assert, and your organs wouldn't collapse.

The danger is the amount of energy required to go that deep without the assistance of weights, as Ezcoo asserts oxygen is the limiting factor. You don't just have to hold your breath, using energy to force down burns oxygen too and without weights you would black out long before you reached any significant depth (40m or so is the only world record I could find as no one bothers to dive like this competitively).

Anyway who's to say our Arma divers aren't packing weights on their belts? And the infantry models have MORE than enough weight packed on them to sink..

I've also seen this, definitely wasn't dead as he was *driving* an Ifrit. He was using a custom skin somehow (underpants) not sure if that's relevant.

+1, should be standard feature etc etc