The Torres Straits are nearly thirty-four leagues wide; but they are obstructed by an innumerable quantity of islands, islets, breakers, and rocks, that make its navigation almost impracticable; so that Captain Nemo took all needful precautions to cross them. The _Nautilus_, floating betwixt wind and water, went at a moderate pace. Her screw, like a cetacean’s tail, beat the waves slowly. Profiting by this, I and my two companions went up on to the deserted platform. Before us was the steersman’s cage, and I expected that Captain Nemo was there directing the course of the _Nautilus_. I had before me the excellent charts of the Straits of Torres, and I consulted them attentively. Round the _Nautilus_ the sea dashed furiously. The course of the waves, that went from south-east to north-west at the rate of two and a half miles, broke on the coral that showed itself here and there. “This is a bad sea!” remarked Ned Land. “Detestable indeed, and one that does not suit a boat like the _Nautilus_.” “The Captain must be very sure of his route, for I see there pieces of coral that would do for its keel if it only touched them slightly.” Indeed the situation was dangerous, but the _Nautilus_ seemed to slide like magic off these rocks. It did not follow the routes of the Astrolabe and the Zelee exactly, for they proved fatal to Dumont d’Urville. It bore more northwards, coasted the Islands of Murray, and came back to the south-west towards Cumberland Passage. I thought it was going to pass it by, when, going back to north-west, it went through a large quantity of islands and islets little known, towards the Island Sound and Canal Mauvais. I wondered if Captain Nemo, foolishly imprudent, would steer his vessel into that pass where Dumont d’Urville’s two corvettes touched; when, swerving again, and cutting straight through to the west, he steered for the Island of Gilboa. It was then three in the afternoon. The tide began to recede, being quite full. The _Nautilus_ approached the island, that I still saw, with its remarkable border of screw-pines. He stood off it at about two miles distant. Suddenly a shock overthrew me. The _Nautilus_ just touched a rock, and stayed immovable, laying lightly to port side. When I rose, I perceived Captain Nemo and his lieutenant on the platform. They were examining the situation of the vessel, and exchanging words in their incomprehensible dialect. She was situated thus: Two miles, on the starboard side, appeared Gilboa, stretching from north to west like an immense arm. Towards the south and east some coral showed itself, left by the ebb. We had run aground, and in one of those seas where the tides are middling—a sorry matter for the floating of the _Nautilus_. However, the vessel had not suffered, for her keel was solidly joined. But, if she could neither glide off nor move, she ran the risk of being for ever fastened to these rocks, and then Captain Nemo’s submarine vessel would be done for.