Well, that's another great addition to the game. The only notice is that tubes' doors are a bit ugly, and rear antenna is not connected to the sub's hull. Also, when opening Museum in game menu, there's a bug with T-sub's deckgun position. But that's just all trifles in comparison with new career in T-sub!
As far as I tested, patch 1.6.2 solves the problem with game crashes and Balao tubes. At least I haven't encountered such problems yet...