the "e13's" crew sought to lighten the submarine by pumping out tanks and discharging fuel, but she had grounded in only of water and would not move. layton realised that he would not be able to refloat the "e13" before the deadline passed and sent his first lieutenant ashore to arrange a tow or, if this was impracticable, to negotiate terms for internment. he was unable to contact the admiralty for assistance, as the germans were jamming radio frequencies.