Hi Tonyroberto,
Opening of these scars as a result of deep diving appears an unwarranted concern. The doctor who indicated "no chance of deep diving" may have been concerned about derangements of blood circulation and off-gassing in the affected pedal areas, or about the strength and flexibility of the foot.
There is no science or medicine that can advise one with any precision on how deep is deep enough to possibly pose risks related to multiple foot surgeries. However, it would appear that given repeated dives to 30m extending max depth to 40m would pose only a very minimal extra theoretical risk, if any. As an aside, 40m still is within the depth range generally described as recreational diving.
It might be prudent to re-inquire of the original physician, or perhaps to obtain a second opinion by a recognized diving medicine expert.
Regards,
DocVikingo
This is educational only and does not constitute or imply a doctor-patient relationship. It is not medical advice to you or any other individual and should not be construed as such.