Lots of tight corridors would make a ship an interesting map to play on. Enemies will probably be pirates or something. Insertion/exfil via RHIB boat or helicopter
https://i.imgur.com/MboAPBk.jpg
https://i.redd.it/86hw6o7jwf371.jpg
Sometimes the corridors will get really tight so players might need to think twice about their weapon choice (e.g. pic 3):
https://i.imgur.com/dS3MFOa.jpg