"Barge" is a much better word; thank you.
As far as I know (which isnt that far), it's pretty well known that "things people build" + water leads to impermanence. Anything on the water continues to exist because of constant maintenance. This thing didn't look painted.
Edited to add: The structure in the article is in my opinion, not a boat: Boats have a means of propulsion, (sails, oars, motor) this floating school is a barge.