hese vessels are exactly the same as the “E” class. The fact that they both accomplished the 13,000-mile voyage from Barrow to Sydney under their own power and without convoy is 75practical proof of the wide range, seaworthiness and general efficiency of the latest British Naval Submarines. The A.E.1 mysteriously disappeared in Australian waters in October, 1914, and has not been recovered.
British Submarines Building.

At the commencement of the great war there were 22 British submarines in course of construction at the various shipbuilding works and naval dockyards. Up to 1909 Messrs. Vickers Ltd., had constructed all the British submarines, but in that year the vessels C.17 and C.18 were laid down at Chatham Dockyard. Since then several other boats have been constructed there, and of those now in hand some are being built by Messrs. Vickers Ltd. at Barrow, others at Messrs. Scott’s shipbuilding yards at Greenock, and a few by Messrs. Armstrong, Whitworth and Co. Ltd. at Newcastle-on-Tyne, and at H.M. Dockyard at Chatham.

76Hitherto, British submarines, although divided into classes—each of which has shown a marked improvement on the preceding class—have been all of one type—the “Improved Holland.” Among the vessels being constructed at the opening of hostilities they were, however, no less than three different types. Those being built at Barrow and Chatham were of the original design with modern improvements, but the submarines under construction at Greenock were of the Laurenti, or Italian type, and those at Newcastle-on-Tyne of the Laubeuf, or French type. In addition to this wise departure from previous practice, two of the new vessels have been given the names of Nautilus and Swordfish.

these vessels, and it is impossible to say definitely which of them have taken their place in the active flotillas, and further the necessity for observing the very strictest secrecy regarding new types of 77warships at a time like the present makes it advisable to give here only the briefest particulars and not to discuss too freely the peculiarities of their design or their probable capabilities.
“F” Class.