Between 25 July and 10 September 1987, an expedition mounted by IFREMER and a consortium of American investors which included George Tulloch, G. Michael Harris, D. Michael Harris and Ralph White made 32 dives to Titanic using the submersible Nautile. Controversially, they salvaged and brought ashore more than 1,800 objects.[42] A joint Russian-Canadian-American expedition took place in 1991 using the research vessel Akademik Mstislav Keldysh and its two MIR submersibles. Sponsored by Stephen Low and IMAX, CBS, National Geographic and others, the expedition carried out extensive scientific research with a crew of 130 scientists and engineers.