Underwater Exploration

The ocean we know - the one we swim, fish and play in - is very different from the deep water far from land. The deep ocean has no light, and the water pressure is so great it can shatter human bones! But that hasn't stopped explorers and inventors developing and improving underwater machines and equipment that have eventually taken people to the deepest places on Earth. Why? To see what's there, of course. Reading Level 29/F&P Level U