many years ago I was balliff of cauldwell dam pond ,we had a snag in top corner next to the road so one weekend about 6 of us got rope and grappling hooks to clean out the snags when it was owned by baggleys builders ,we found the offending article to be a mattress that someone had lobbed in of the road , pleased at the find we thought well we haven't got dressed up for nothing so we carried on grappling ,after about 2hrs we hit this thing and we thought it was the plug to let the water out it was super heavy we all got on it and pulled it was a big safe still locked and not next to the bank either dont ask how it got there , so thoughts went to money and riches and divvying it up when awhile later on of the guys pulled out a sawnoff shotgun , that was it police and when it was opened no cash .