Sea-going Vessels.

Submarines of 900 tons (U.25-U.30 completed, and U.31-U.37 completing), range 4,000 miles, speed 18/10 knots, armament 4 torpedo tubes and 4 q.-f. guns: (in commission and completing)13
Submarines of 800 tons (U.21-U.24), range 3,000 miles, speed 14/9 knots, armament 4 torpedo tubes and 3 q.-f. guns: (in commission)4
Submarines of 400–500 tons (U.19-U.20), range 2,000 miles, speed 13 ½/8 knots, armament 3 torpedo tubes and 2 q.-f. guns: (in commission)2
Submarines of 300 tons (U.9-U.18), range 1,500 miles, speed 13/8 knots, armament 3 torpedo tubes and 1 q.-f. gun: (in commission)10
Submarines of 200–300 tons (U.2.-U.8), range 1,000 miles, speed 12/8 knots, armament 2 torpedo tubes: (in commission)7
Total Sea-going Submarines36

Coast Defence Vessels.

Submarines of 200 tons (U.1), range 700–800 miles, speed 10/7 knots, armament 1 torpedo tube: (in commission)1
——
Total number of vessels in German Flotillas37

AUSTRIAN NAVY.

Sea-going Vessels.

Submarines of 800 tons (U.7-U.11), range 3,000 miles, speed 14/9 knots, armament 4 torpedo tubes and 3 q.-f. guns: (completing—delivery doubtful)5
Submarines of 300–400 tons (U.5-U.6), range 1,500 miles, speed 12/8 knots, armament 2 torpedo tubes: (in commission)2
Submarines of 300 tons (U.1-U.4), range 1,500 miles, speed 13/8 knots, armament 3 torpedo tubes: (in commission)2
Submarines of 200–300 tons (U.1-U.2), range 800 miles, speed 12/8 knots, armament 3 torpedo tubes: (in commission)2
——
Total number of vessels in Austrian Flotillas6

When war commenced all the vessels of the German Flotillas (30 to 37) were concentrated in the North Sea and Baltic. The Austrian Flotilla of six vessels was in the Adriatic. Great Britain had in home waters 74 submarines and 14 others on duty in the outer seas. France had several of the 92 vessels composing her powerful flotillas at her oversea colonial naval bases. Russia had 14 submarines in the Baltic, 11 in the Black Sea, and 12 in the Far East. The Japanese Flotilla (17) was concentrated in Japanese waters.

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