Our own mine-laying and coastal patrol would be more exciting if the possible successes were not limited to an occasional submarine. It is a little dull to be always laying traps for a flotilla that never comes. The work of our coastal submarines is therefore monotonous; but it is none the less invaluable. Besides making sure, it trains a continual succession of crews for oversea work, and gives experience to young commanders. The number of boats increases every year, and the flow of volunteer entries keeps pace with it. The standard demanded is very high, and it is fully maintained. The prize of efficiency is immediate entry into the hardships and dangers of the oversea patrol.
There is no doubt that the hardships are more trying to our men than the dangers. The oversea patrol is kept up through the winter. The weather off the enemy’s coast is often very severe, and boats have to be shut down for long periods. In summer, the work of diving patrols is almost equally arduous, owing to the longer hours of daylight. Boats must frequently be submerged for nineteen or twenty hours at a time; and after the first twelve of these, the air, in spite of purifiers, becomes oppressive to breathe--not even the head of a match will burn. Then there are two special conditions tending towards depression. First, the positive results are few, and form no measure of the work or the risks. Results are obtained, but never in proportion to the devotion and sanguine hopes of the Service. It is a baffling and trying experience to live for days with your eye glued to a periscope--the field of vision is contracted, and too close to the water. The psychological effect of the strain would be bad in the case of any but highly trained and selected officers--as one of them has said, the sighting of a surface enemy is a relief seldom obtained. The Germans are fortunate in the daily, almost hourly, sighting of targets. But their officers, in consequence of continual heavy losses, are commonly sent to sea undertrained, and their results are naturally poor in proportion to the torpedoes expended.
The second of the two causes which would discourage any but the finest spirit, is the fact that an almost complete silence broods over the Submarine Service. Not only is the work done mostly in the deep-sea twilight; but, however arduous and creditable it may be, it is seldom recognised publicly. Rewards are given, but not openly. A commander may reappear for a day or two among his friends, wearing the ribbon of the D.S.O. or the V.C., or both, but little or nothing will be published of the actions by which he won them. It is not only that information must be kept from reaching the enemy--and naturally the German Admiralty is always anxious to know how their boats are lost--but there is also a settled custom in our Navy, a custom older than the Submarine Service, by which ‘mention in despatches’ is confined to incidents during which one or both sides have been under fire, from gun or torpedo. Custom in the Navy is generally a sound rule; but in this particular instance, the custom did not grow up to fit the case, and does not fit it. The Admiral does not say anything on this point; but he tells us that the real danger a submarine commander has to face is not the gun or the torpedo. He may come off his patrol without having been shot at by either, and yet may be entitled to the credit of having been in action for days and nights on end. In fact, every minute that he is in enemy waters he is in danger from mines, and from a host of formidable pursuers--aeroplanes and Zeppelins with bombs, and fast anti-submarine craft with depth-charges and explosive sweeps. No doubt all ships are to some extent in danger from mines, but no other class of vessel is asked to run the gauntlet on the enemy’s coast to anything like the same extent. If surface ships are sent, they are sent for a single operation, the ground is prepared for them as far as possible, the period of exposure is short, and when the work is done the force is withdrawn. But our submarines are, for days and weeks at a time, close to known mine-fields and in areas most likely to hold new or drifted mines. They are harassed by hunters to whom they can make no reply, and particularly by aircraft, which can detect them even at sixty feet below the surface. The areas in which they work are comparatively narrow, and so closely patrolled by small craft that it is seldom possible to come to the surface in daylight; navigation, too, is very difficult, and the rapidly changing densities of the water off the enemy’s coast make the trimming of the boat and the depth control a matter of constant anxiety.