"We are so NOT in the Navy!
But, the balcony cabins are so high above the water line that if I need to worry about them withstanding the kind of water pressure that the ocean can bring to bear"
Wish that was true, if the ship lists to one side in a storm etc the last thing you want are open balcony doors. How many degrees does a ship have to list, to then pour water through the "high up" balcony door?
Not a lot in a lot of seas, and we all dont just sail in the Carib in good weather