From 1883 to 1885 he explored with Garde, the east coast of Christian IX Land, as far as 66 ° 8' N. Holm discovered 11 hitherto unknown Eskimo communities, numbering 431 inhabitants, and five great ice fiords.
From 1883 to 1885 he led the Umiak Expedition with T. V. Garde, exploring the east coast of Christian IX Land, as far as 66 ° 8' N using umiak boats. The expedition discovered 11 hitherto unknown Inuit communities, numbering 431 inhabitants, and five great ice fiords.