| CHAPTER | I. | WHICH IS INTRODUCTORY. |
| CHAPTER | II. | IN WHICH THE PROJECT IS UNDERTAKEN. |
| CHAPTER | III. | AT THE BOTTOM OF THE SEA. |
| CHAPTER | IV. | A WONDERFUL NARRATIVE. |
| CHAPTER | V. | A BOLD ESCAPE. |
| CHAPTER | VI. | THE SUNKEN ISTHMUS. |
| CHAPTER | VII. | A SERIOUS CATASTROPHE. |
| CHAPTER | VIII. | THE VILLAIN OUTWITTED. |
| CHAPTER | IX. | THE SUNKEN CITY. |
| CHAPTER | X. | AT THE TREASURE CAVE. |
| CHAPTER | XI. | POOLE PLAYS A NEW CARD. |
| CHAPTER | XII. | A TURNING OF TABLES—THE END. |