The boat set out from Gizo in Western Province in a north-east direction on January 15 bound for South Choiseul with five men, two women and two children onboard.
Five days later, a search party found the boat capsized to the east of their destination, near Kia in Isabel Province, with no sign of those who were on board.
Police superintended Vincent Eria said it was believed the boat flipped when it encountered rough seas during the 100km journey.
"The boat was found floating upside down with the 40 horsepower outboard motor," he said.
