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.

There follow three and a half years of desperate World War One adventures fighting for the House of Habsburg aboard primitive, ill-equipped vessels, contending not just with exploding lavatories and the transport of Libyan racing camels but with a crew drawn from a dozen different nationalities-and a decaying imperial bureaucracy which often seems to be even more of an enemy than the British, the French, the Italians and the sea itself. ()