You can't even snorkel without your back on top of the water. The diaphragm muscle can't work under the surface. Too weak. Scuba only works 'cause it's compressed air

Yeah but,Ive been a fan for 55 yrs,you know.

Oh yes!

The book.

Drop tubes,counting bombs,it's my favorite book.

Read the book.No Powered Armor,no Starship Troopers.Long live R.A. Hienlien.