We were imprisoned in the ice on September 23d, and from my last observations I inferred that our location was about latitude 77° North and longitude 160° West. The sun made his appearance for a brief interval each day, and I calculated that the long Arctic night would be fully set in by the last of October. The rifts in the roof of our prison afforded us no opportunity for determining our location. Our recent danger had revealed the fact that we were moving. We tried the sounding line and found that we were in deep water, and that our motion was evidently due to the motion of the ice-field. We were floating at the mercy of the winds and ocean currents. But whither would they carry us? None could tell. Assuming, however, that the currents were north-bound, and reasoning from the fact that the motion of the earth was from west to east, the tendency being, as it were, to slip from under us, we concluded that as long as the ice was floating freely, our general motion would be toward the west and north. For the present we were safe and comfortable with the ship securely fastened to the solid walls of our prison. But we knew summer would come, and the warm rays of the sun would beam down on us for months, melting and breaking up the frozen surface of the ocean which was now our security, but might then become the cause of our destruction. Our future safety, and the success of the expedition, demanded that we should have easy access to the surface, so that we could make the necessary observations, and, if possible, find some means of providing for the safety of the ship and crew when the ice went to pieces. This was the task before us, but we had no means of calculating the time it would take. All we knew was, that the two ice mountains by coming together had formed a roof over our heads, and towered many feet above the ship's masts, and if their other dimensions were in proportion, it might take a long time for us to tunnel through to the surface. We felt that there was no time to lose. All needful arrangements were soon perfected under the direction of Battell, who took charge as engineer and manager. The ice-bench on our larboard was selected as the point of starting. The crew was divided into three reliefs, each with a foreman, and the work of excavation went on without intermission. This arrangement gave eight hours for work in the tunnel, and sixteen for rest and recreation.