Sinking of the RMS Titanic cultural phenomenon, commemorated by artists, film-makers, writers, composers, musicians and dancers from the time immediately after the sinking to the present day. On 1 September 1985, a joint US-French expedition led by Robert Ballard found the wreck of "Titanic", and the ship's rediscovery led to an explosion of interest in "Titanic"s story. Numerous expeditions have been launched to film the wreck and, controversially, to salvage objects from the debris field. The first major exhibition of recovered artefacts was held at London's National Maritime Museum in 1994–95. In 1997, James Cameron's eponymous film became the first movie ever to take $1
Geology of the Pacific Ocean . The Pacific Ocean developed from the Panthalassa, a vast global ocean, following the breakup of the supercontinent Pangaea in the Mesozoic Era, gradually forming Gondwana and Laurasia, which in turn divided. There is no firm date for when the changeover occurred, as the replacement of the sea bed is a continuous process, though reconstruction maps often change the name from Panthalassic to Pacific around the time the Atlantic Ocean began to open. The Panthalassic Ocean first opened around 750 million years ago at the breakup of Rodinia, but the oldest Pacific Ocean floor is only around 180 Ma old.