Of course, the submarine fleets of the various navies paid a heavy toll too. It has become, however, increasingly difficult to get any accurate figures of these losses. The British navy, it is known, has lost during 1914, 1915, and 1916 twelve boats, some of which foundered, were wrecked or mined while others simply never returned. The loss of eight German submarines has also been definitely established. Others, however, are known to have been lost, and their number has been greatly increased since the arming of merchantmen. In 1917 it was estimated that the Germans lost one U-boat a week and built three.
Just what sensations a man experiences in a submerged submarine that finds it impossible to rise again, is, of course, more or less of a mystery. For, though submarines, the entire crew of which perished, have been raised later, only one record has ever been known to have been made covering the period during which death by suffocation or drowning stared their occupants in the face. This heroic and pathetic record was written in form of a letter by the commander of a Japanese submarine, Lieutenant Takuma Faotomu, whose boat, with its entire crew, was lost on April 15, 1910, during manœuvres in Hiroshima Bay. The letter reads in part as follows:
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U. S. Submarine D 1 off Weehawken.
Although there is, indeed, no excuse to make for the sinking of his Imperial Majesty's boat and for the doing away of subordinates through my heedlessness, all on the boat have discharged their duties well and in everything acted calmly until death. Although we are departing in pursuance of our duty to the State, the only regret we have is due to anxiety lest the men of the world may misunderstand the matter, and that thereby a blow may be given to the future development of submarines. While going through gasoline submarine exercise, we submerged too far, and when we attempted to shut the sluice-valve, the chain in the meantime gave way. Then we tried to close the sluice-valve, by hand, but it was too late, the rear part being full of water, and the boat sank at an angle of about twenty-five degrees.
The switchboard being under water, the electric lights gave out. Offensive gas developed and respiration became difficult. The above has been written under the light of the conning-tower when it was 11.45 o'clock. We are now soaked by the water that has made its way in. Our clothes are very wet and we feel cold. I have always expected death whenever I left my home, and therefore my will is already in the drawer at Karasaki. I beg, respectfully, to say to his Majesty that I respectfully request that none of the families left by my subordinates shall suffer. The only matter I am anxious about now is this. Atmospheric pressure is increasing, and I feel as if my tympanum were breaking. At 12.30 o'clock respiration is extraordinarily difficult. I am breathing gasoline. I am intoxicated with gasoline. It is 12.40 o'clock.
Could there be a more touching record of the way in which a brave man met death?
More interest in submarine warfare than ever before was aroused in this country when the German war submarine U-53 unexpectedly made its appearance in the harbour of Newport, R. I., during the afternoon of October 7, 1916. About three hours afterwards, without having taken on any supplies, and after explaining her presence by the desire of delivering a letter addressed to Count von Bernstorff, then German Ambassador at Washington, the U-53 left as suddenly and mysteriously as she had appeared.