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I just posted my recollections about this jetbarge. The A frame supports the hose which was connected to a Georgia? Pump (I think that is what we called it.) The hose went down to a jet sled with a series of angled nozzles so that the pumped water would excavate a trench under the pipe on the sea bed thus allowing the pipe to settle into said trench. I was on board the jet barge for 1 night with the engineer who was tasked with making the system work. We had all sorts of problems with the pump which kept breaking down.
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