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The pond in question is surrounded by trees on all four sides and is in a wood. It does not look like a clear sandy bottomed lake.

I've also removed the location from your post as there are undoubtedly people who scan the forum hoping for leads on possible sites who may undertake an excavation illegally when they know the...

Don't forget, it's always the 'unloaded' gun that will kill you, or in this case the 'knackered explosive'.

Your first priority will be to make sure the items down there are safe and not likely to empty the pond into the sky. Removing them will be a task if you don't know this and on school property will...