These boats collect sand from the bottom of the lagoon and sell it to make concrete. This is crazy. Humans swim to the bottom with A BUCKET and scoop sand, swim up, dump in boat and back down again. OMG. Of course my first question is how does the boat not sink whilst collecting sand?! It will. Eventually. That’s why these boats are everywhere! This is a pic of a sand boat full. See how low it is to the water? There’s like an inch break from the water to the rim of the boat… It is known courtesy to slow your boat to no wake when passing sand boats.

Sand boats pre sand. Big difference!