The weeklong weather delay put the expedition on edge. Then on March 20, a potential clearing appeared in the forecast. Captain Buckle set a course for the Challenger Deep, more than 200 miles out ...

The Challenger Expedition of 1872–6 was conceived to examine the deep sea floor worldwide and disprove the theory of a 'dead zone' in the oceans below a certain depth. Using a modified Royal Navy ship ...

Challenger Deep, in the Mariana Trench ... The trench's depth was first measured during the Challenger expedition in 1875. But it wasn't until the 1950s that scientists recorded its deepest depth. The ...