On a further sounding of 1,900 fathoms ( 11,400 feet , 3,500 m ) gave Shackleton additional evidence of the non-existence of New South Greenland .
On 25 August a further sounding of 1,900 fathoms ( 11,400 feet , 3,500 m ) gave Shackleton additional evidence of the non-existence of New South Greenland .