"Breakdowns of machinery alone would hardly account for the loss of vessels, but they might do so indirectly—first, by leaving a vessel exposed to the mercy of rough weather; secondly, by damaging the hull and letting the water in. Fractures of propeller shafts or of propeller blades are not infrequent occurrences. Neither is damage to a rudder. It is quite conceivable that a vessel disabled thus for several days and encountering exceptionally heavy weather, might be overwhelmed by the sheer force of the waves. In rough weather the chance of a disabled vessel being seen in mid-Atlantic if she drifts out of the regular routes is very slender. Steamers for many years past have been entirely dependent on their machinery, having no sails to fall back on. Only in recent years have the most modern and best liners been fitted with twin screws and double sets of engines, one of which remains available if the other is damaged. A disabled vessel might, therefore, in the past have suffered badly if she drifted out of the trade routes, and might have gone down in bad weather.
"Damage to machinery may also be sufficient to explain the loss of a vessel by causing her to sink at once. The City of Paris, of the Inman Line, had a big smash in one of her engine rooms on the 25th of March, 1890. She was coming home in fine weather, and when she was near the Irish coast the starboard engines broke down in consequence of the fracture of the starboard propeller shaft, and the sea filled the engine room. Then the massive fragments of the wrecked engine hammering against the bulkhead smashed that and allowed the water to flow into the engine room, completely filling that also. In about ten minutes both engine rooms were filled with water, adding 3,000 tons to the vessel's weight. Yet she still floated securely, and the outer skin was not damaged in the least. The water-tight compartments kept the City of Paris afloat for three days until help came to tow her into Queenstown. At Queenstown the openings in the sea connections of the vessel were closed with the assistance of divers. The water was pumped out of the engine rooms, and with her port engines and one screw the vessel renewed her voyage and went on safely and quietly to Liverpool without harm to anyone. In the case of the P. and O. steamer Delhi, which stranded on December 12, 1911, off Cape Spartel, on the Morocco coast, all the passengers were rescued, including the Duke of Fife and the Princess Royal and her daughters.
"Capsizing is not so likely a cause as some others, but it is possible. The Captain capsized, with the loss of hundreds of lives. The type was, however, very different from that of the liner. But the draught of a vessel diminishes toward the close of her voyage, as coal is reduced. Some vessels are unsteady, and it is conceivable that heavy weather, shifting cargo, and insufficient ballast may cause a vessel to roll over on her beam ends and capsize. There is little doubt that the Wartah capsized by reason of top-heaviness. One of her life buoys was reported as being found (December, 1911) at Waiuku, New Zealand.
"But the most probable cause of unexplained losses of ships at sea is fire, or it is one, at least, which divides probabilities with explosions and icebergs. Even on the supposition of an explosion, it seems almost inexplicable that no trace of a sunken vessel should ever afterwards be seen. A missing liner or other large vessel is a source of interest to all seafaring men, and a keen outlook is kept on the track which the vessel was known to have taken. Any stray spar or belt or bit of wreckage, therefore, could scarcely escape observation. If a vessel sinks in mid-ocean some portions float. But if a vessel is burned everything would probably be consumed, as the vessel would burn to the water's edge. Boats might or might not be launched, according to the rapidity of the rush of the flames, the state of the weather, etc. If boats are launched, say, a thousand miles from land, the chances of rescue or of making land are remote. Fire, therefore, seems adequate enough to account for the loss of some of the numerous vessels which have never been heard from after leaving port.
"Considering other possible external causes of the total disappearance of liners, heavy weather must be regarded as a probable reason in some instances. Although we do not admit that the roughest weather would harm a modern liner, we must remember that the older vessels were not as large and powerful as those of the present time. The Pacific, for example, which disappeared in 1856, was not nearly half the length of the latest vessels. Bulkheads had not been brought to the perfect condition of security which they have now attained. Not infrequently even now steamers become water-logged and reach a sinking condition and their crews are happy if rescued. It may well have happened that vessels have foundered in mid-ocean in consequence of not being able to receive assistance, while the sailors could not take to their boats with any hope of living in the tempest.
"Uncharted rocks also cause the loss of vessels, as in the case of the Pericles. But her captain was a man of resource and no lives were lost.
"Icebergs are a probable cause for the loss of some vessels, especially of liners running to Canadian ports. The damage to the Arizona may be instanced, and many other vessels have had hairbreadth escapes. A vessel insufficiently secured by bulkheads would stand a poor chance in collision with an iceberg.
"Tidal waves are probably accountable for some unexplained losses. There are three classes of such waves—those due to submarine seismical disturbances, solitary waves occurring in an otherwise calm sea (the origin of which is obscure), and cyclonic waves. Each is very dangerous, the first and last chiefly in the vicinity of coasts, the second out at sea. It was a seismic wave which wrought such havoc at Lisbon in 1755 and in Japan in 1896, when 30,000 people were killed. But the effects of these do not usually extend far out to sea, as do those of solitary waves. Many records of the latter have been given where the decks of vessels have been swept of all hands and of all deck erections. In 1881 all hands were washed off the decks of the Rosario. In 1882 the master and half the crew of the Loch Torridon were swept off the deck by a tidal wave. In 1887 the Umbria was flooded by two great waves. In 1894 the Normania was struck by a solid wall of water reaching as high as the bridge, smashing the cabin on the promenade deck, and carrying away the music room and the officers' quarters. The height of tidal waves ranges from forty to eighty feet. The Cunarder Etruria was struck by a tidal wave on the 10th of October, 1903, when a Canadian gentleman was killed and several wounded. The captain's port bridge and stanchions were carried away. Though such waves would not greatly endanger the huge modern liners, they might have swamped their predecessors by breaking through the decks or rushing down hatchways and skylights. Many vessels have been lost by being pooped by vast storm waves, which are not as high as many tidal waves.
"In reference to mysterious agencies, these can be dismissed in the present state of knowledge. The secrets of the sea have been investigated so well that no destructive agent is likely to exist that is not known to science. Collision with a whale would not damage a liner, though it would be bad for the whale. The sea serpent may be dismissed without comment. The eruption of submarine volcanoes may be dangerous to small vessels, but the idea of harm from them can not be entertained in connection with the Atlantic service. So that, after all, we are driven back for the solution of these disappearances to the same causes which are known to have wrecked so many vessels. Among these must be included collision with derelict wrecks, which have been known to drift about in the Atlantic for over a twelvemonth, and unhappily the malicious placing of explosives among the cargoes of liners, as was done at Bremerhaven in 1875."