I think they mean it when they say "No Trespassing"...
Most people have an alarm or a dog, but I guess a cannon could be just as effective.
In case you're wondering, this is the S.S. Beaver, a museum ship in Victoria's harbour.
W.O 365
A Picture-A-Day side project from the creator of The Wandering Oak blog. April 1, 2010 to April 1, 2011.