Hello Peethambaran

Regarding marine Engineering 

Marine engineering course:

It is not like any another B.E./B.tech. it fully specializes you to work on ship at sea. Ship's engine's proper working and monitoring its working status that is mainly their work on ahip apart from many other job-tasks that are considered dangerous in our day to day life . job is risky life will be risky .

if you have interest you can go for marine engineering otherwise go for mechanical engineering