Mission to recover Emiliano Sala's body and that of his pilot has begun

But it warned on Tuesday that strong tides "mean we can only use the remotely operated vehicle (ROV) for limited periods each day".

"Regardless of the results, we will not be making a further statement until the families have been informed," it said.

- 'Technically possible' -

Shipwreck hunter David Mearns had earlier warned that "time is of the essence" in an underwater operation like the one being launched by Britain off France's northern coast.

"As tragic as the loss is, it's made much, much worse if the body is never recovered or (the family) never get an answer to what happened," Mearns said.

"Finding it is just the starting point. The AAIB has got to investigate it."

Sala was flying to join up with Cardiff from his old French team Nantes.

His signing was the most expensive in the Welsh club's history and marked what fans had hoped would be a turning point in its bid to avoid relegation from England's top division.

Mearns said his discovery of two seat cushions on the French coast last week revealed that the plane had broken up.

"It's in one area (on the seabed), it's all one mass, but some bits may not be connected. So what you don't want to do is to disturb the body in a way that you lose it," he said.

Sala's family raised more than 370,000 euros ($422,000) in an online campaign to pay for the private search.

"Had that not happened, I don't think anybody would have searched for the plane," Mearns said.

"We were told by the AAIB that they didn't feel that there was much to be gained," he said.

The AAIB ended up chartering a ship to join Mearns on Sunday.

He said recovery was now "technically possible -- the water depth isn't an issue really, and the weather can be managed with the right ship".

"It's a matter of will to do it," he added.