Michael Douglas -- Prison Can Save My Son

For a man whose son will spend the next 5 years behind bars, Michael Douglas is still incredibly optimistic -- claiming Cameron's experience in prison could ultimately save his life.

[[tmz:video id='0_ua50qzxj ']]
In an interview with "Today," Douglas says the sentence Cameron received for his role in a major drug dealing operation was "adequate" -- and claimed that if his son wasn't in the big house, he'd end up dead.

Michael added Cameron hasn't been sober for this long "since he was 13 years old."