Lazy shits! They had 80 years to take care of that.
I live near Aberdeen proving grounds. They’ve been building and testing munitions there since pre-WWI.
There’s tons of unexplored munitions in some areas, including very well marked coastlines on the Chesapeake Bay.
I’ve heard that they frequently start wildfires when they blow stuff up. If they can’t extinguish it with a water cannon they use helicopters. No one ever steps foot in those areas.