Really like this episode. Very reminiscent of a submarine battle.
I love Quark's maniacal laughter!
Something of a team-building episode, and inspired by submarine movies by the looks of things. It's divided up into separate character sequences and some of these work better than others. The highlights come from Kira/Sisko and Quark/Hanok.
It's surprising to me when I realise that it takes until this far into the show for Kira and Sisko to start relating to each other as more than work colleagues, and finally being friends. The journey here has felt very worthwhile, and it's quite delightful to see them reach a place where they are so at ease with each other. Being Bajoran, Kira has always had to view Sisko as either her commanding officer or a religious icon, and neither are particularly helpful for creating a comfortable relationship. This episode lets her finally see him as a person and there's some joy to be taken from that; part of DS9's strength is that we really follow these characters and their gradual changes make sense.
Quark and the alien Hanok trapped in the mess hall with an unexploded missile is just fun. It works so well not only due to good writing, but the fact that they got an actor with the calibre of James Cromwell to play against Armin Shimmerman. They work brilliantly together both when arguing and working together.
The rest of the episode is mixed. The Bashir/Dax pairing shows (again) how much the doctor has matured and grown since his early days, but doesn't really give the characters much to do. Worf gets to really understand what it's like to be in command and allows himself to learn from O'Brien's advice, a nice part for his character on this new path. It's a rare treat to see some of the lower-decks engineering crew and they're interesting enough. Overall, a solid episode but it feels like a diversion more than anything.