Egyptian officials made their most specific allegations against the captain of a container ship that blocked the Suez Canal for nearly a week in March, accusing the skipper of losing control of the Ever Given and hitting the vital waterway’s bank.

The ship swerved left and right before becoming lodged in the bank of the canal, said Sayed Sheisha, the chief investigator for the Suez Canal Authority. “The captain issued eight commands within 12 minutes as he tried to bring the ship back into alignment.”

The question of who is to blame for the accident is at the heart of a dispute over how much compensation the ship’s owners should pay. Egyptian authorities seized the ship in April and are now demanding $550 million to cover lost revenues, damage to the canal and the cost of rescuing the ship.

The Japanese company that owns the ship, Shoei Kisen Kaisha Ltd., didn’t respond to calls and emails seeking comment. The company that manages the ship, Bernhard Schulte Shipmanagement Ltd., also didn’t immediately respond to a request for comment.

A lawyer for the Japanese company has previously blamed the Suez Canal Authority for allowing the ship to enter the canal during a massive sandstorm that was taking place in Egypt at the time. Initial investigations into the accident had focused on a sudden gust of wind.

Earlier this month, an appeals chamber at Ismailia Economic Court heard recordings showing disagreements between Suez Canal Authority pilots and its control center over whether the ship should enter the canal, according to people familiar with the matter.

Lawyers representing Shoei Kisen Kaisha said the authority shouldn’t have allowed the ship to enter the waterway and that the ship should have been accompanied by at least two tug boats.

Egyptian authorities have asked for $550 million to cover lost revenues, damage to the canal and the cost of rescuing the Ever Given.

The Ever Given’s insurer, UK P&I Club, said that the insurer and the ship’s owners are committed to a fair and amicable resolution of the matter, in comments made on Saturday before Egyptian authorities made the allegations against the captain.

The Ever Given, one of the largest cargo ships in the world, ran aground in the Suez Canal on March 23, causing global supply-chain chaos as hundreds of ships piled up in a backlog on either side of the canal.

The ship was freed on March 29 after six days of work by Egyptian engineers and sailors with help from a Dutch specialized salvage company.

Egyptian authorities impounded the ship on April 12 and are refusing to allow the ship to leave until its Japanese owners agree to pay compensation. The Suez Canal Authority initially demanded more than $900 million but later reduced the amount it sought as compensation.