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That first picture looks suspiciously like ones I have seen before of royal marines training in and around poole harbour and also North Devon.
I would not be suprised if some local scallywags with a couple of blow up dinghys and a few naff markers have attempted to cash in on the regular training that goes on in these areas.
Its either a practical joke or a really naff attempt at trying to do something that could be a really cool and origional concept if it where a: thought out properly and b: legal
Still looks like a crack tho!!