Admiralty list of wrecks, 112. Admiralty Salvage Section, formation of, 95. Admiralty Salvage Section, ships salved by, 111. Admiralty Salvage Section, work on Belgian Coast, 115. Adventure aboard American submarine, 149. Adventure of diver, 208. Air bags, ships salved by, 206. Air keeps back water, 85. Air-lock, 85, 87. Air-pressure blows man to surface of sea, 151. Air _versus_ water, 35, 36. Allies and shipbuilding programme, 113. _Alphonso XII._, treasure recovered, 57. American Line, 165. American salvage records, 156. American submarine, discovery of drifting, 144. American submarine F.4, tragedy of, 152. American submarine O.5 sinks, 151. American submarine S.5, ordeal of, 141. Amsterdam, 31. _Araby_, 174–179. Argyll, Duke of, 21. Armada wreck, discovery of, 17. Arming merchantmen in war, 97. Armistice, war wrecks salved after, 112. Armit salves a ship in halves, 181. Armit, Tom, 181, 205. Atrocity, _Belgian Prince_, 118. _Audacious_, H.M.S., 19. Award of £22,000 for salvage, 184. Bad weather foils treasure-hunters, 47. Ballast tanks in submarine, 132. Ballast, using sea as, 111. Battle with sand, 30. Battleship floating upside-down, 87, 90. Battleship raised by compressed air, 90. Battleship, salving a, 79–93. Battleship, shells salved from wreck, 84. Battleship sinks upside-down, 82. Baulks of timber, 90. Belgian coast, salvage work on, 115. _Belgian Prince_, tragedy of, 118, 119. Bell of _Lutine_, 26. Blasting for treasure, 31. Blasting through bulkheads, 169. Blazing sea, 161. Blazing ship shelled, 162, 163. Blow-pipes melt submarine’s plates, 138. Boilers as bollards, 191. Bollards made from boilers, 191. Bombay, 188. Boulogne harbour, clearing of, 175. Brave deed of salvage men, 199. Breathing compressed air, 35, 36. Breault, Henry, imprisoned for thirty hours in submarine, 151. Britain’s food supplies restricted, 96. _Britannia_, extent of damage to, 172. _Britannia_ torpedoed in Mediterranean, 173. British battleship torpedoed, 173. British diving record, 38, 68. British Government and war wrecks, 112. British Government insures all ships, 96. British Navy’s treasure-hunt, 65–78. British sailor escapes from sunken submarine, 149. British salvage companies and Admiralty, 94. British Salvage Section carries German submarine 40 miles, 158. British Salvage Section fights U-boat menace, 97. British Salvage Section, method of working, 97. British submarine disaster, 133. British warships and spontaneous combustion, 216. Brown, Lawrence, imprisoned for thirty hours in submarine, 151. _Brussels_, raising the, 159. Bude, torpedoed ship beached near, 197. Bulkheads, 107. Bulkheads cause trouble, 169. Bullivant’s cable, 191. Burial at sea, 130. Burning ship sunk, 162. Business men and treasure, 11.