Rubuta ci gaba ga wannan sakin layi - A lokacin da ya dawo cikin sabis a watan Maris na 1907 Mulock ya shiga horo na torpedo a HMS "Vernon". Ba da daɗewa ba kafin Scott ya gayyaci Mulock ya shiga tare da shi a karo na biyu na polar; matashi mai suna Lieutenant ya yarda ba tare da jinkiri ba. Sai Ernest Shackleton ya rubuta masa ya gayyace shi ya shiga cikin Nimrod Expedition
Ka yi haƙuri. Saboda yarjejeniyar da aka yi da Scott, Mulock ya ƙi amma ba da gangan ya haifar da kishiya ta hanyar bayyana wa Shackleton cewa Scott yana shirin "zuwa kudu"; ba abin mamaki ba ne cewa a watan Afrilu 1908 Mulock ya kasa cancanta a matsayin mai kula da torpedo. Commodore J. Briggs, RN, ya umurci "Vernon", ya rubuta a kan rikodin sabis na Mulock cewa "rashin nasararsa na cancanta a cikin torpedo ya kasance saboda rashin kulawa", a fili ya tsawata wa kokarin Scott da Shackleton. A shekara ta 1908 an nada Mulock zuwa (Kyaftin Henry Oliver, RN) a shirye-shirye don umurnin kansa.