chunk: In thick fog, Clubin sails for the Hanois reef from where he can easily swim to the shore, meet the smugglers, and disappear, giving the appearance of having drowned. Because of the fog he has mistakenly arrived at the Douvres reef, which is still halfway between Guernsey and France. Left alone on the ship, he is terrified, but he sees a cutter and leaps into the water to catch it. At that moment he is grabbed by the leg and is pulled down to the bottom.
  Everybody in Guernsey finds out about the shipwreck. Mess Lethierry is desperate to get the Durande's engine back. His niece declares she will marry the rescuer of the engine, and Mess Lethierry swears she will marry no other. Gilliat immediately takes up the mission, enduring hunger, thirst, and cold trying to free the engine from the wreck. In a battle with an octopus, he finds the skeleton of Clubin and the stolen money on the bottom of the sea.