Heh, no I put the power armor on and wandered around underwater for awhile before heading home to Red Rocket. I now have 3.5 sets of power armor, and I've decided the way to go is to keep a set in every quadrant of the map...

I found that power armor underwater...and drowned in it...it had a helmet but no legs, methinks having any missing pieces will likely limit your air supply considering the frame itself isn't waterproofed...nice little touch,

maybe i drowned because i equipped it underwater and it was likely filled with water though?

edit-did some testing it's the latter, guess just missing legs isn't gonna drown you, which when i think about it makes sense because the helmet probably acts like an underwater air pocket...unequipping the helmet then re-equipping after you've already exposed your head to the water seems to drown you in the same fashion

Since I had the aqua girl perk, I suppose it wouldn't matter for me if the armor was full of water or not, eh?

ummm yup, us lesser endurance creatures could not possibly survive in the water for long without the air capsule of the power armor helmet