Board Thread:Episodic and Issue Discussion/@comment-47881-20130213170533/@comment-1629132-20130216104722

Atlanteans can drown. And we don't know if that applies to Kryptonians in this universe. SUperman's powers are sometimes altered in continuities. He has had to wear space-gear before in outer space. Sometimes he hasn't. And he can hold his breath far longer than a humans. So in Earth-16 I don't think it has been mentioned yet whether or not Kryptonians can.