Whales and Ships and Boats - Why Do They Float?

Sooooo.... Just how do Giant Whales float in the ocean - and What about those huge ships that weigh TONS? How can they possibly stay afloat? Some videos are attached that may help (It's all PHYSICS). And then there are those magical words - Buoyancy, Density Volume and Mass and how they are all related...

What say we test this out with a boat that you make with your own two hands - out of a heavy lump of clay that will not only stay afloat but carry weight as well? Can it be done? Let's find out! Get ready to put on your Captain's hat and let's sail away on the Sea of Knowledge, Mates!