africa air-independent propulsion alan turing alfred gwynne vanderbilt allies of world war i allies of world war ii anglo-german naval agreement anti-submarine warfare arctic arms race baltic sea battle of jutland battleships bell island blockade bombe brandtaucher british empire capital ship cargo ship charles frohman chicago commander computer das boot depth charge diesel engine elektroboot engineer enigma machine erich raeder escort carrier ferromagnetism foxer fuel cell gal class submarine galveston bay german navy german type ii submarine german type ix submarine german type i submarine german type mittel u submarine german type ub iii submarine german type ub ii submarine german type ub i submarine german type uc ii submarine german type uc i submarine german type vii submarine german type xiv submarine german type xxiii submarine german type xxi submarine german type x submarine german language germany greece gulf of mexico high seas fleet huff-duff hydrogen intensified submarine warfare inventor italy kiel kiel week kobold kriegsmarine list of austro-hungarian u-boats list of u-boat aces list of u-boat flotillas list of u-boat types list of u-boats never deployed list of successful u-boat commanders list of successful u-boats magnetic anomaly detector magnetic pistol materiel molch museum ship new jersey newfoundland and labrador north america norway ore orkney wireless museum penang periscope project gutenberg q-ship radar reinhard scheer robert kurson royal navy saint-nazaire scapa flow seehund shadow divers sonar south korea soviet union steel submarine submarine snorkel submarine warfare texas the enemy below torpedo treaty of versailles turkey uncompleted u-boat projects united kingdom united states united states navy unrestricted submarine warfare vanderbilt family west germany wikimedia commons wilhelm bauer winston churchill wolf pack wolf pack endrass wolf pack hai wolf pack hecht wolf pack lachs wolf pack pfadfinder wolf pack steinbrock wolf pack wolf wolfgang petersen world war i world war ii