In one of the biggest mysteries in modern aviation, the Boeing 777 vanished over the southern Indian Ocean on 8 March 2014 with 239 people on board.
The bulk of the Malaysia Airlines aircraft has never been found, and in January 2017, the search was discontinued.
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Debris found in the Indian Ocean has been identified as coming from the missing aircraft, but nothing larger than an outboard wing flap has been discovered.
Now a US-based company called Ocean Infinity will continue the search on a "no find, no fee" basis, sailing from Durban in South Africa.
On Saturday, the Malaysian transport minister Liow Tiong Lai said the government was committed to continuing with the search, but that he didn't want to give too much hope to the next of kin.
"The basis of the offer from Ocean Infinity is based on 'no cure, no fee'.
"That means they are willing to search the area of 25,000 square kilometres pointed out by the expert group near the Australian waters."
Ocean Infinity said the vessel was taking advantage of favourable weather to move toward "the vicinity of the possible search zone".