In the first two issues, Subby teams up with Triton again, and loses his power to breathe underwater when he fights a space alien. Triton dumps him on a beach.
Then in the next issue…
We get the first appearance of Stingray.
I wish I liked these issues more, but they’re just Sub-Mariner formula stories: Someone hurts his feelings/body. His pride gets hurt. It makes him do something stupid. Then he goes off angry in the end.