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Hope rose Sunday that salvage efforts could free a mammoth container ship that has blocked the for six days, crippling international trade and costing the global economy billions.

As extra boats steamed in to assist with salvage efforts, experts were pinning hopes on a Sunday evening high tide to help dislodge the vessel.

The MV Ever Given, longer than four football fields, has been wedged diagonally across the canal since Tuesday, towering over nearby palm trees and strangling world supply chains.

The crisis has forced companies to choose between waiting or rerouting vessels around Africa, which adds a huge fuel bill, 9,000 kilometres (5,500 miles) and over a week of travel to the trip between Asia and Europe.

Richard Meade, an editor at data and news company Lloyd's List, said sources close to the salvage operation had voiced optimism "that the vessel could be moved within the next 24-48 hours".

Each day of the blockade could be costing global trade some $6-10 billion, according to a study published Friday by German insurer Allianz.

That translates to some 0.2 to 0.4 percentage points of annual trade growth each week.

And with over 300 ships and billions of dollars-worth of cargo now stalled at the entrances to the Suez Canal, many operators have already rerouted vessels around the Cape of Good Hope.

Suez Canal Authority (SCA) chief Osama Rabie had told reporters on Saturday that the megaship could be afloat by Sunday night, depending on how it responds to the high tides.

Ships re-routing

He also told an Egyptian news channel the ship had moved from side to side for the first time late Saturday.

"It is a good sign," he said, adding that 14 tugboats were deployed around the stricken vessel and salvage crews were working round the clock.

Salvage teams are pressing efforts to remove sand around the ship, with 27,000 cubic metres (over 950,000 cubic feet) cleared so far at a depth of 18 metres, SCA spokesman George Safwat said Sunday.

But Ihab Talaat el-Bannane, a former Egyptian admiral, cautioned that the accident had taken place in a part of the canal where the ground was rocky and difficult to dig.

"At some point, the ground experts will have to stop digging to avoid earth collapsing onto the ship," he said.

The area has been placed under tight security, with extra military and police personnel deployed.

A high tide was expected to start Sunday night.

Plamen Natzkoff, an expert at VesselsValue, has warned that if efforts to float vessel during that high tide, there could be further delays.

In response, there has been a "surge" in the number of vessels opting for the African route, Lloyd's List said Sunday.

"Most major container lines are now diverting ships round Cape of Good Hope and warning of supply chain disruption ahead. Some are starting to reject bookings," it said on Twitter.

Cargo giant Maersk said that by the end of the weekend, a total of 32 Maersk and partner vessels would be directly affected by the blockage, with 15 redirected.

That "is expected to rise while the salvage assessment is being made," it said.

French shipping giant CMA-CGM said Sunday two of its Asia-bound vessels would be re-routed, while it was considering air or rail transport for some clients.

'Human error'

Allianz warned the blockage was "the straw that breaks global trade's back".

"Suppliers' delivery times have lengthened since the start of the year and are now longer in Europe than during the peak of the Covid-19 pandemic," it said.

Egyptian media reported President Abdel Fattah al-Sisi had ordered "preparations" to offload containers in order to lighten the ship.

The 200,000-tonne MV Ever Given veered off course in the Suez Canal on Tuesday, with officials blaming 40-knot gusts and a sandstorm.

But Rabie on Saturday said "technical or human errors" could have grounded the grounding of the Taiwan-run, Panama-flagged container ship near the southern end of the 193-kilometre (120-mile) long canal.

Some 369 ships are currently stalled as they wait for the canal to reopen, Rabie told the Al-Arabiya news channel Sunday.

An AFP correspondent saw dozens of ships anchored in the Gulf of Suez.

Egypt is losing some $12-14 million in revenue from the canal for each day it is closed, Rabie added, while Lloyd's List has said the blockage is holding up an estimated $9.6 billion-worth of cargo each day between Asia and Europe.

Russia also offered assistance Sunday, following other countries including the United States that have made similar offers.

In a sign of the knock-on effects, authorities in war-wracked Syria said the crisis had hit its fuel imports from Iran and forced it to ration already scarce supplies.

Romania's animal health agency said 11 ships carrying livestock out of the country were also impacted, with NGO Animals International warning of a potential "tragedy" affecting some 130,000 animals.