Can some One with cardiomyopathy do scuba diving?

Sounds like "no".

Severe Risks

Venous emboli, commonly produced during decompression,

may cross major intracardiac right·to·left shunts and enter

the cerebral or spinal cord circulations causing neurological

decompression Illness. Hypertrophic cardiomyopathyand

valvular stenosis may lead to the sudden onset of unconsciousness

during exercise.