Did armour make drowning more likely?

Were drownings a larger share of ancient naval battle casualties because armoured men lacked flotation equipment?

Heavy armour made survival in the water much harder. A 20-kilogram training vest illustrates the approximate burden.

A 20-kilogram training vest illustrates the approximate weight of the body armour under consideration. Going into the water with that burden would make swimming and survival much harder. The weight explains the hazard, although comparative drowning rates are not given.