Quote:
Originally Posted by popatim
Gumball, how sure are you of that answer? It doesn't seem logical in a closed system; the displaced water has no place to go so the level raises.
Maybe only one lock is closed at a time? (ie  open system)

when i initially though about it i was in the same mind set as you. from the numbers the bridge is 981 meters long, 34 meters wide and 4.5 deep. that stated you have 132,651 cubic meters of water.
if the ship is 120 meters long by 12 meters wide with it'* hull going 4 meters deep it would only displace 5760 cubic meters of water.
i don't even know the vessels are that big. but in any event the weight of the ship is dispersed through the whole bridge through the water. per square meter on the bridge floor force per ship sized above would only increase ~ 4%
so that stated open loop vs closed loop is negligable.