BBC Focus Magazine

[M Paul Lloyd]

Time was we knew more about the Moons surface than we did about the deep ocean floor, although we probably still do but we are getting there.
Oceans' deepest depth re-measured
By Jonathan Amos Science correspondent, BBC News, San Francisco

US scientists have mapped the deepest part of the world's oceans in greater detail than ever before.
The Mariana Trench in the western Pacific runs for about 2,500km and extends down to 10,994m.
This measurement for the deepest point - known as Challenger Deep - is arguably the most precise yet.
The survey, conducted by the Center for Coastal and Ocean Mapping (CCOM), was completed to help determine the exact extent of US waters in the region.

More here.
http://www.bbc.co.uk/news/science-environment-15845550