He was a serving commander in Indian Navy when caught. He admitted and that's why I believe his case was rightly heard in the Military court.
But he will have a chance, 60 days to file an appeal to a superior military court and then if the decision is upheld, another chance in SC. I believe SC will convert his punishment to life long sentence, which is fair enough as his life will be more miserable in the jail.
Ask army men, what do they prefer? Spending 30-35 years in a foreign country without their family and only seeing another face three times a day (or even less as the food is served by opening a lid at the bottom of the cell's door). One day a week walk, that too with prisoners having bad bad record is really really difficult.
I seriously want his sentence to be converted to life long imprisonment by higher military tribunal or SC, and I am 99.9% sure, the same will happen.
No offense, but I am feeling claustro just reading this.
There is a term for this.
It's called stir crazy.