Edit: Physics
Reason: All cading stuff can be pushed by running into it.
from the map's fpsb page:
A Note to Server Administrators:
This map has a point_servercommand inside it. Without it the boats will not work and the cannon won't function properly. If you have a point_servercommand override plugin, then you'll need to make a .cfg for this map with sv_turbophysics 0 in order for the boats and cannon to work.