In preparation for our own Canal Transit tomorrow, I have been through the Canal twice with other vessels. When I was with Lady Jane III I took along my pocket camcorder to shoot some video that would help me explain to my linehandlers (none of whom will have been through before) what to expect.
The quality is awful -- most is shot at night, and the camcorder is picking up a lot of wind noise -- but it might be of some interest. I couldn't film everything because I sometimes had work to do. I think they got something from it, but I'll go through every stage with them before we set off.