I thought almost all cannons were cast of brass or it close cousin, bronze? I don't think I have ever seen a cast iron cannon, although many of today's "guns" are iron and not brass/bronze. It was known rather early on that iron and the sea did not mix well.
Seems like side scan sonar is the ticket for wooden boats, but only if they are higher than their surroundings. Other than that, and it's a lot of guess work and diving to locate one.
Seems like side scan sonar is the ticket for wooden boats, but only if they are higher than their surroundings. Other than that, and it's a lot of guess work and diving to locate one.