The Soviet ice strengthened transport ship Ob of about 12,500 tons was in Wellington in January 1971 as part of the 15th Soviet Antarctic Expedition.
On board was this Antonov AN2T CCCP-44956 (c/n 1G25-29)
This was first registered on 17-01-1963 and was part of the Polyamaya Aviatsiya.
I believe it was was cancelled in 1978.
Below are two shots of CCCP-44956 being assembled on the ice.
As nicked from the aviaforum.ru