1 a.m.
`` I can not say , sir , '' replied the man as he handed a code message to his superior . Decoded , the `` wireless '' was as follows : `` Station 41 to unterseebooten . Two hundred gallons of fuel available here . Will be on the look-out for signals at 1 a.m. '' The message was a `` general call '' for a secret petrol depot to any German submarine operating in the vicinity . Reference to the list of stations showed that `` 41 '' was at Port Treherne , a remote cove on the North Cornish coast about fifty miles from St. Mena 's Island . `` I suppose it 's safe , '' remarked Rix . `` With due precautions -- yes , '' rejoined Kapitan Schwalbe .