Stephen Sackur profiles Greg Stemm, the American behind the controversial exploration of HMS Victory in the English Channel. The ship, the predecessor to Nelson's Victory, sank in 1744 with the loss of over 1000 lives. Stemm and his company, Odyssey, have already recovered two rare bronze cannon and are seeking permission from the British authorities to raise the rest of the cargo, which may include valuable treasure. Stephen talks to crew members from Stemm's exploration team, as well as marine archaeologists, about the man who started off as Bob Hope's assistant but always dreamt of underwater exploration.