Maersk Line has brought in salvors Smit and Arden to extinguish the fire on its Maersk Honam off India's Lakshadweep Islands.
The Danish company said the Indian Coast Guard started firefighting on Thursday with one ship.
The first two specialised firefighting vessels arrived on Friday morning and have begun tackling the flames.
Maersk has sent two technical engineers to Salalah, Oman, to work closely with Smit and Ardent.
Palle Laursen, chief technical officer, said: “We are appreciative of the partnering assistance we’ve received from local Indian authorities and we must now let the salvage team do their work.
"It is still too early to determine the cause of the fire or the impact to the vessel or cargo. Obviously, finding the cause of the fire is very important to us and a full investigation will be conducted as soon as possible.”
Crew ashore
A total of 22 evacuated crew members from the 15,262-teu ship (built 2017) have now disembarked in the cities of Cochin and Trivandrum in southern India.
They have all received professional medical treatment and have been offered crisis counselling, Maersk said.
Three have reportedly been hospitalised in intensive care.
Another seafarer died from his injuries, while the search for four others missing since Tuesday is continuing.
Maersk has said hope is fading for them, however.
“We are relieved that a majority of our colleagues have been released from the hospital," Laursen said.
"We, however, remain deeply concerned about the health condition of our colleagues still in hospital and are grateful that they are in the capable hands of medical professionals. We are in regular contact with the hospitals and monitor the situation of all our colleagues."
