Assassin's Creed - 60fps - Gameplay - How to drown?

Assassin's Creed HD Gameplay Mission: Jump on the Boat. Altair can climb on the Tallest, Deadliest Buildings in the city without any Fear. He is the Master of Combat, Stealth, Parkour(Free-run) Assassination, can do any deadly thing which a common man never wanted to do, but He always drown in the water, can't swim. Funny