Searchers have completed a second day combing challenging terrain in Milford Sound for a tramper reported overdue shortly after midnight on Monday.

There is still no sign of the missing man, whose intention had been to climb Devil's Armchair near the northern end of the Milford Track.

Access to the search areas has been difficult and searchers have encountered challenging terrain, including the steep rock faces, dense bush and moss-covered boulders that are characteristic of the Fiordland region.

Along with Police Search and Rescue and LandSAR personnel, specialist Alpine Cliff Rescue (ACR) teams from Queenstown and Wanaka searched the route that it’s believed the man intended taking. 

Another specialist team skilled in Canyoning searched other areas of interest, including gorge and river areas. 

The air search continued through the day.

Additional search and rescue personnel and volunteers from Dunedin and the local region will be joining the search on Wednesday morning.