Ludwig Kohl-Larsen visited the island with his wife Margit in 1927/8. Whilst camping near Elsehul he describes, in his book 'South Georgia - Gateway to Antarctica', Bluntisham Books 2003, translated by William Barr:
Then, to combat the cold, she walked to Undine Harbour, and reported that on the narrow neck she found three planks set in the ground. There was a nail visible in the exposed end and the heaped-up earth indicated that this was a grave. It is probable that an American sealer may have found his last resting place here on the narrow isthmus with the eternal southwesterly gales roaring over him, long before the whalers reached South Georgia.
This may refer to either the very prominent isthmus in Undine Harbour itself or to the narrow gap between Elsehul and Undine Harbour - the narrowest part of the island.