If you're short on context, the context is this: the Mariana Trench is the deepest subsea place on the planet, reaching a known depth of more than six-and-three-quarters miles (some measurements are deeper but unconfirmed). Only two people have been down there, together, back in 1960 aboard what's known as a bathyscaphe. The pressure there is something like 1,100 times greater than that at sea level--enough to crush most submersibles like an empty beer can. The temperatures down there are absolutely frigid. So naturally, Virgin is going to send a lone human down there.