A couple of weeks ago there was a news report about a wide hollow space in the earths crust under water.?

Question

Admiral Byrds Diary

Answer 1

There's an expedition to study a break or "hole" in the earth's crust in the mid-Atlantic where normal crust is absent and mantle-type rocks are exposed at the seafloor. The science team from the UK " will use sonar to image the seafloor and a robotic seabed drill to collect rock cores."
http://www.msnbc.msn.com/id/17407745/