In the spring of 1915, a young Austro-Czech naval lieutenant Ottokar Prohaska finds himself posted to the minuscule Imperial and Royal Austro-Hungarian Submarine Service in the Adriatic port of Pola. In some trepidation at first, because he has no experience whatever of submarines, his fears are soon set at rest when he discovers that nobody else has either: least of all his superiors.

Aboard primitive, ill-equipped vessels, he contends with exploding lavatories. ,transport of Libyan racing camels.a crew drawn from a dozen different nationalities-and a decaying imperial bureaucracy,more of an enemy than the British, the French, the Italians and sea. After surmounting all this, he becomes - accidentally - Austria Hungary's leading U-boat commander and a holder of its highest military decoration. But by 1918, they have no vessel. no country, no coast.