Ah, the spaceships as submarines episode, another ST staple.
Aside from a handful of present day slang phrases that pop up here and there (Uhura has oddly been the biggest offender in this regard), I find the show is on pretty solid footing. I even quite like exploring
[Show spoiler]the Gorn as this series' big bads, as long as they continue to keep it in continuity with TOS' Arena.
4/4