Tell me what is Deep Surface Scan from Pandora

I needed a software to recover some files from several computers and I installed Pandora Recovery.

It was a little complicated but I got the job done.

The only thing I did not knew is a features of the software called Deep Surface Scan.

I recovered files, but I haven't used this features because I didn't knew its use.

Can you help me solve this problem and tell me what is Deep Surface Scan used for?

I would appreciate answers from people who used the software with this function.