Bus being transported on four small boats - GIF

[Tooler2]

This might LOOK like four small boats, but they all rise and fall in EXACTLY the same relation to each other. They are either fixed together very very securely, or it's a barge with four bows, constructed like two catamarans.

I imagine the bus is on a full length ''ramp'' lashed to the boats. I wonder if they can use the tide to float the ensemble?