Tomb Raider II Controls

I was really enjoying the nostalgia of play this game on my 27" iMac. Sadly once I got to Venice I was unable to get out of the boat once I got into it. No sequence of controls (on both the keyboard or on my Logitech dual action game pad) seems to work. As a result it was a pretty short game! Am I missing something obvious?

Boccherini about Tomb Raider II, v1.0