Diver, why he cannot whistle, 73. Diver works in darkness, 214. Divers and inquisitive fish, 202, 203. Divers and mud, 204. Divers beaten by depth, 47. Diver’s boots, weight of, 39. Divers breathe compressed air, 35. Diver’s code, 40. Divers communicate with submarine prisoners, 137. Divers discover the lost K.13, 136. Divers, fat and slim, 34, 35. Diver’s feat in Severn tunnel, 50–55. Divers feed submarine prisoners, 137. Divers fight on seabed, 200. Divers gassed, 178–179. Divers lash pontoons to wreck, 89. Diver’s luck, 15. Diver’s palsy, its cause, 36. Diver’s physique, 34. Divers, risks of, 49. Divers share nearly £6,000, 78. Diver’s strange experience, 69. Divers survey wreck of _Leonardo da Vinci_, 82. Divers use hacksaws, 190. Divers use pneumatic chisels, 165. Divers wear masks, 170. Divers work at 190 feet, 157. Divers work in mud, 168. Divers work on Belgian coast, 116. Diving bell crushed by pressure, 154. Diving code, 40. Diving dress, 39. Diving dress, all metal, 42. Diving dresses, ancient, 41. Diving, rate of ascent, 37. Diving record, British, 38. Diving record, British, date of, 68. Diving, science of, 34. Diving strains, 34, 35. Diving to 304 feet, 155. Diving tragedy, 178. Donegal, 65. Doubloons discovered, 18. Dredger, salving a, 188. Dredging a 1½-mile channel, 89. Dress, diving, 39. Drill worked by air, 194. Drills, diamond, used on Clyde, 195. Drink, a lucky, 64. Duke of Argyll, 21. Duncan, Admiral, 22. Dutch claim _Lutine_, 24. Dynamite, cutting ship in two with, 181. Electric cable laid 1½ miles out to sea, 84. Electric magnet, 210. Electric pump, invention of, 103, 104. Electric pump, weight of, 104. Electric torch, wonder of, 169. Electricity helps to salve battleship, 84. Emergency patches, 206. Enderslie Rock, 195. Enemy buried at sea, 130. Engineer patches ship with concrete, 180. Engines raise a ship, 164, 165. Ensor, Henry, 94, 186–194. Entombed in submarine, 133. Entombed miners rescued, 42. Erostarbe, Angel, his diving record, 48. Escapes from sunken submarines, 139, 145, 146–152. Explosion off Waterford, 122. F.4, American submarine disaster, 152. F.4, discovery of, 153. F.4, plans for recovery, 153. Falmouth, _City of Paris_ towed to, 183. Faruffini, General, 93. Ferrati, General, 81. Fight on seabed between divers, 200. Finisterre, Cape, 46. Fire, disaster to oil tankers, 161. Fire in sunken submarine, 151. Fish and divers, 202, 203. Fish scent death, 204. Fishing for treasure, 24. Flags stuck in maps, 99. _Fleswick_, salving the, 187. Floating dock proposed for raising _Leonardo da Vinci_, 81. Flooding of Severn tunnel, 51. Floor of gold, 61. _Florencia’s_ treasure, 19. Fluess, 51–53 _Flying Dutchman_, 167. Folkestone, 163.