These guys didn’t know what to do on vacation so they decided to make a raft using a few boards and a bunch of plastic bottles to set out on a voyage.
In the background you can see sacks full of plastic bottles. They paid about $7 to a couple of local homeless people to have them collected. There are about 1,500 empty plastic bottles there.
They drilled their boards and then used bolts and screws.
They packed their bottles into sacks and figured out their raft had a load-carrying ability of 2 tons which was enough for the people (about 400 kg) and the raft itself (350 kg).
They numbered each part of the raft and disassembled it to transport to the Don. When assembled, the raft was impossible to transport.