| CHAPTER | | PAGE |
| [I. ] | The Ominous Warning on Shipboard | 13 |
| [II. ] | The Torpedoed Ship | 25 |
| [III. ] | Prisoners on Board of a Submarine | 37 |
| [IV. ] | The Terrors in the Dark Room of an Undersea Boat | 49 |
| [V. ] | Some of the Mysteries of a Submarine | 58 |
| [VI. ] | Groping Through the English Channel | 68 |
| [VII. ] | Caught in the Deep Sea Nets | 78 |
| [VIII. ] | The Night's Struggle to Free the Vessel | 89 |
| [IX. ] | The Capture of the Submerged Vessel | 99 |
| [X. ] | The Secret Key to the Bomb Fuse | 110 |
| [XI. ] | Operating the Submarine with a Captive Crew | 120 |
| [XII. ] | The Death Blow to the Submarine | 130 |
| [XIII. ] | The Rescue in the Channel | 142 |
| [XIV. ] | Ten Hours in the Danger Zone | 151 |
| [XV. ] | A Frightful Mine Explosion | 161 |