Remember everyone, if a monster asks you for your credentials, give them to him!
His hair is different, but this Deep One looks like the foreman from the last time Kevin was in the Relay Station. If that is the case, I have no explanation for why he doesn’t recognize Kevin beyond my claiming he’s being formal. Kevin doesn’t recognize him because… he’s Kevin.
There are a lot of Call of Cthulhu references here. Though, from the point of view of the inhabitants of the Relay Station, it was a case of people trespassing on private property, the homeowner trying to defend himself, and assault.