The company searching for Malaysia Airlines Flight MH370 could know within a week whether the plane is in a spot considered the most likely crash site by CSIRO scientists.

The search restarted in earnest yesterday after the Seabed Constructor reached the 25,000sqkm identified by the Australian Transport Safety Bureau and other experts as most likely to contain the debris.

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The high-tech mothership was expected to deploy up to eight Hugin autonomous underwater vehicles almost immediately in the south-eastern extremity of the area of the zone and near a position at latitude 35.6°S and longitude 92.8°E described by the CSIRO as the most likely location of the aircraft.

A team headed by CSIRO scientist Dr David Griffin used drift modelling and an analysis of satellite imagery to define the site.

There are several other hots spots.

They said other nearby locations east of the 7th arc were also possible and there was a range of less likely locations on the western side of the arc, near 34.7°S 92.6°E and 35.3°S 91.8°E.

US firm Ocean Infinity has been contracted by the Malaysian Government to search for the wreckage on a “no find, no fee” basis that could see it take home between $US20 million and $US70 million if the wreckage is found.

Ocean Infinity can scour 1200sqkm of ocean floor a day and the group of independent experts estimates the 25,000sqkm area could be scanned within 21 days and the highest priority 5000sqkm within a week.

This includes the CSIRO’s preferred spot, which is about 66 nautical miles (122km) from where the ship stopped on Sunday.

However, it could be Wednesday or Thursday before any results emerge, given data from the AUVs are stored on hard drives that can be downloaded only after they are recovered. Dives can last more than two days.

Time is also needed to analyse the data.

However, in a blog post on Sunday, one Independent Group member Victor Iannello argued it was impossible to determine any one location with a high level of certainty.

“The satellite data and the drift models allow a broad range of possible impact sites. Within that range, there are at best some ‘warm spots’ that are based on assumptions about navigation inputs,” he said.

“So, it becomes a numbers game — the more area searched, the higher probability of finding the wreckage.

“I subjectively believe there is a 33 per cent chance of finding the wreckage in the first 25,000sqkm.

“If there is time and money to search at +/- 25 NM from the 7th arc all the way to a latitude of 26S, I subjectively put the chances of success at around 67 per cent.

“That might seem like bad odds, but realistically that’s higher than they’ve ever been.”

As well as the torpedo-shaped Hugins, the Seabed Constructor is equipped with two remotely operated vehicles that could be used to retrieve debris if it finds the plane.

However, what happens once the plane is found is a decision that will have to be made by the Malaysian Government.

If the Boeing 777 is not found in the 25,000sqkm area, Seabed Constructor will move north along the 7th arc to other possible areas identified by the international Independent Group and the University of Western Australia.

All of the groups agree on the general area for MH370’s resting place but not on where it might be along the arc.

UWA and IG predicted the landfall of most debris from MH370 well over three years ago. UWA has identified a location just further north.

UWA Professor Charitha Pattiaratchi said last year that its reverse drift modelling put the location of MH370 “at Longitude 96.5 E Latitude 32.5 S with a 40km radius”.

That location is just south of a major fault line called Broken Ridge – due west of Perth.