The supposed new search zone seems to be around 32°S to 33°S on the 7th arc. This area contains the deep ravine called the Diamantina Fracture Zone, located on the Southern End of Broken Ridge.
This ravine plunges to 1400M below the surrounding sea bed in the 7th arc search area.
The ravine runs approximately NW to SE, and its SE section contains the Diamantina Trench and the Diamantina Deep, one of the worlds deepest ocean trenches, measured in 1961 by the Australian oceanographic research vessel, the Diamantina, at 8,047M (26,401').
Diamantina Fracture Zone
Broken Ridge is indicated on many photos, including ATSB snapshots, as being the actual ravine. The truth is that Broken Ridge is a plateau that runs N/NE from the Diamantina Fracture Zone - and the Southern side of Broken Ridge is a steep escarpment that plunges up to 3000M within short distances, making for one very steep face.
ATSB MH370 search map
New seamounts discovered on Broken Ridge
What is interesting is that the search has uncovered, with clear imaging, a steel tank or steel box from a shipwreck, a 19th century iron shipwreck, and even a 200 litre steel oil drum.
I'm a little surprised that a lot more general seabed litter and debris hasn't been discovered; but the seabed in the region appears to be relatively clean, possibly due to the limited amount of shipping travelling this region.
Metal tank found in MH370 search
ATSB - MH370 search images
I'm fully expecting the wreckage of MH370 will eventually be found, and it will quite likely be found in a ravine, or a steep part of the Broken Ridge escarpment which has helped to hide it for so long.
What is puzzling is that aircraft wreckage on the seabed generally leaves a trail of wreckage over a distance, and one would have expected at least one modest-size component would have been picked up by now.
The inference from the total lack of seabed MH370 debris finds, is that they are definitely looking in all the wrong places, and the flight distance calculations need re-examining.
ATSB - Summary of possible MH370 debris finds