In this respect the gas had an immense advantage over any apparatus which would set the ship on fire. Let the fire be never so rapid, one boat at least might get away, and on that boat the very person whom it was most desirable should seek the floor of the ocean. Moreover, fire could be seen from a vast distance, and might attract attention from other vessels, who by day would observe the smoke, and by night the glare of the flames. But in this case probably not so much as a flag would be hoisted. One by one the seamen and passengers, the captain and officers, would succumb to the invisible vapour, first becoming weak and helpless, and next “unconscious.” The steersman would fall at the wheel. The engineer would drop at his engine; the stoker as he shovelled up the coal; the passenger would lie in his berth. And the steamer, so long as the fuel in the furnace lasted, would pursue her way unguided over the waves; finally, after a few hours, to float a derelict at the mercy of the wind. There was a completeness, a finish, an elaboration of detail about this scheme which fascinated the conspirators. It was so novel, daring, and yet safe, it enchanted them. When at last the great horror was discovered, what risk would there be? Nothing on board would excite suspicion. The gas had actually no smell; besides, long before anything was discovered, it would have dissipated itself. Even if the whole of the cargo was examined, the case itself would offer, no handle to an inquirer. The powerful acid would have eaten its way out, and nothing would be left but a small empty case with a hole in it. Nothing need show who consigned the case. Better still: Marese’s yacht would follow the doomed steamer, keeping close on pretence of the safety of having company in a voyage across the Atlantic. They would easily know when the desired result was obtained by the view of the steamer rolling helplessly in the trough of the waves. By the time that was the case some hours would have elapsed after the catastrophe, and various pretences could be arranged to avoid immediately proceeding on board—especially as from a distance nothing would look the matter—and by then the poisonous vapour would have dissipated itself, or so mixed with the air as to have lost its fatal power. They would then take charge of the vessel and bring it into port, and claim the salvage. If they contrived to select a vessel which carried a valuable cargo, that salvage money would be something extremely large in amount, added to the value of the steamer itself. They might manoeuvre to get such a cargo stored. This would be far superior to the clumsy dodge of sinking the ship and claiming the insurance money.