"The bed is getting cold and you're not here, the future that we hold is so unclear, but I'm not alive until you call," she posted earlier, saying she loved Mr Efremychev and would never give up hope.
On Sunday, just 24 hours after Mr Efremychev went missing, his partner also posted about him.
"Never stop believing in hope because miracles happen everyday," she wrote.
"Another day is going past but my hope still remains strong, I will be waiting home ... Let's all hope for the best."
Photos on her page show Mr Efremychev holding a newborn baby, which were captioned "father and son time".
As of last night, there was no sign of Mr Efremychev.
After the inflatable boat flipped on Saturday, his mate managed to swim to shore and raise the alarm.
The police national dive squad accompanied by the police launch Deodar have been scouring the area and specialist sonar equipment from the navy was also being used in the search.
Aerial searches by the police Eagle helicopter and a Coastguard fixed-wing aircraft were also carried out, as well as extensive searches of the shoreline.
The incident is the second in the Rodney area in recent months.
On October 14 Stewart Atutahi, 37, from Snells Beach and 22-year-old Nicholas Stubbs from Warkworth went missing after setting off in a fibreglass boat from Martins Bay.
Mr Atutahi was skippering the boat and his body and wreckage of the vessel were found soon after the men were reported missing.
Mr Stubbs' body was found on November 1 near Kawau Island in the Hauraki Gulf.
The deaths have been referred to the coroner.
