There’s a gap in equipment between SCUBA diving and snorkelling. Freedive bridges that gap. With Freedive people can dive to six meters and stay there for over an hour without surfacing. No need for cumbersome SCUBA gear, special training, or to be tether
Just add water concrete cloth This stuff is amazing! You could even build a shelter with it. It is actually concrete in a flexible cloth form. Add water it becomes hardened concrete! FARM SHOW - Just Add Water: "Concrete Cloth"