"Nice little summary"
That link includes one expert saying “Unless you’ve got intimate contact between two munitions subsurface, you’ll rarely cause the other to detonate, because water is a very good mitigator. If you’ve got a 1,000lb bomb two metres from another 1,000lb bomb, the other one won’t go bang. I know that for a fact – I did it last Tuesday.”
Somehow, I don't see a cargo ship sailing across the Atlantic in the middle of the war having the spare carrying capacity to have been loaded with a couple of metres separation between items of cargo.
I wonder how many of these bombs have remained watertight over the last 73 years.