Authorities remain on call, but the X-Press Pearl wreck remains stable, the ship's operator said on Friday.
X-Press Feeders said there were still "no signs of debris and no reports of fuel oil pollution" from the 2,743-teu, 2021-built boxship as of Friday night.
"Salvors were able to retrieve the anchor and remain on scene to deal with any possible debris supported by the Sri Lankan Navy and the Indian Coast Guard, who have oil spill response capabilities on standby," the Singaporean company said, reiterating its statement from Thursday.
X-Press Feeders also said a seafarer rescued from the X-Press Pearl who later tested positive for Covid-19 is asymptomatic. A second who suffered leg injuries while evacuating is recovering at a private hospital.
The ship, laden with 1,486 containers, including 25 tonnes of nitric acid, caught fire off Colombo on 20 May and burned for 11 days before the fire was brought under control.
On 2 June, reports circulated that the ship was sinking, but the next day X-Press Feeders said the aft section had come to rest at a depth of 21 metres with the forward section continuing "to settle down slowly".
The fire was called the worst marine incident in Sri Lanka's history on Monday, and officials worry the wreck could cause years of ecological damage as plastic pellets and hazardous waste have begun washing up on beaches.
The day before the fire broke out, the ship was held at Colombo's anchorage as it awaited an open berth. It made a request to offload and reassemble a box containing nitric acid, but was denied.
