The Camp Croft mechanics explored creating a submersible jeep.
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“1943 Press Photo Army Mechanics at Camp Croft Make Army Jeep Submersible. This is an original press photo. The Army Jeep is a “submarine.” Army mechanics at Camp Croft, South Carolina, waterproof the motor and other vital parts and then traveled along the bottom of a shallow lake. The tube in front is an elongated exhaust pipe. Photo measures 9 x 8.25 inches. Photo is dated 07-03-1943.”
I’ve seen NEW Jeep vehicles with this exhaust pipe set up, I think it’s just for show, I doubt that they are waterproof.