A cargo ship is the shape that works best: long and thin with high sides. You can even load it with more weight. Clay is more dense than water and sinks if you shape it into a small cube or sphere.

A new supercapacitor design that uses only water, clay and graphene could source material on Mars and be more sustainable and ...

“I started using clay soil to mold vessels and bricks of different sizes when I was in class two.This was when I realised that I had a gift but back then, I did it purely for leisure,” he say ...