If the money was dropped into the Mariana trench prior to March of this year, it could’ve been retrieved by director James Cameron. Cite
According to wikipedia, there will be more chances:
As of February 2012, at least three other teams are planning piloted submarines to reach the bottom of the Mariana Trench. These include: Triton Submarines, a Florida based company that designs and manufactures private submarines, for which a crew of three will take 120 minutes to reach the seabed; Virgin Oceanic, sponsored by Richard Branson’s Virgin Group, designed by Graham Hawkes, and piloted by Chris Welsh, for which the solo pilot will take 140 minutes to reach the seabed; and DOER Marine, a marine technology company, based in San Francisco and set up in 1992, for which a crew of two or three will take 90 minutes to reach the seabed.