Trailmakers High Seas Cargo Sub Run 

Making a sub large enough to hold a shipping crate burned through my budget quickly, so I went with a mostly UFO engine powered build.
The clamping mechanism was achieved by weakening the outer sets of hinges enough to press against the cargo without blowing up or spinning around. The nose is angled in a way where it can be parked up against the docks in Danger Zone or High Seas and will stay put. Since it’s UFO engine powered it can be lightly beached for loading/unloading and still pull back in to the water.
Left one block free in the budget to attach a magnet if needed.
Can be found in Xbox Gallery.