[1] Ventilation ducts fitted with valves to prevent water from entering the hull [2] Device for allowing the escape of rarefied air [3] Top view porthole [4] Side view porthole [5] Hinge of the dome which allows access inside the hull [6] Drill for attaching the box containing the bomb to the target [7] Vertical screw propeller [8] Explosive box containing a clockwork device and 70 kilograms of powder [9] Device for releasing the explosive box [10] Depth gauge [11] Horizontal screw propeller [12] Horizontal propulsion crank [13] Pedals for transmitting motion to the horizontal propulsion cranks [14] Thick plank serving as seat and reinforcement of the hull [15] Compass [16] Water pumps for expelling leaked water outside the hull [17] Water pumps' handle [18] Rudder's tiller [19] Rudder's transmission mechanism [20] Rudder [21] Ventilation pump for taking fresh air into the hull while expelling rarefied air out of it [22] Valve for preventing water from entering into the hull [23] Coil of the rigging of the emergency ballast [24] Tackle for lifting the emergency ballast [25] Ballast consisting of 90 kilograms of lead placed under the floor. To increase buoyancy in the event of emergency, the operator could release the ballast letting it sink, retrieving it later by means of a 15-meter long rope and its associated rigging [26] Valve actuated by a pedal for allowing water into the hull, to serve as ballast [27] Pistol (the operator possibly carried a weapon with him) [28] Ballast block

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