Is there historical stuff on deep bottoms?

The bottom of the sea is full of very interesting things. You can find wrecks of planes, submarines and many kinds of boat belonging to any period and time. Even a wooden boat from the past can survive more than 1000 years under the sand!!! But also is possible to find different things as weapons, like  unexploded bombs, ore more ancient cannons, swords, scaffoldings and many other things fallen into the water during the battles of the past.