> YAG-37 project
"We took an old Liberty ship and filled the hull with Styrofoam so it wouldn’t sink. We got four spare engines, surplus jet [turboprop] engines off a Constellation airplane, mounted those engines on forty-millimeter rotating platforms, and drove the ship with these. We had four of them and could drive the ship at about eight knots. We named her DUMBO. They used up a lot of fuel. We took it down to Panama City and ran it through the minefields for pressure signatures. And it worked. It actually worked well enough that we got it into a shipbuilding program to actually build some, instead of this experimental platform. We were trying to find some way of sweeping pressure mines in particular …"
"The four turboprop aircraft engines used in the conversion were Pratt & Whitney T34s taken off a Navy Lockheed R7V-2 Super Constellation transport aircraft. "
https://www.usni.org/magazines/naval-history-magazine/2023/december/yag-37-project