Marine engineering is a hardcore mechanical industry to work in. Anyone who likes field work can surely opt for this career. By  becoming a marine engineer, one can have the opportunity to work in the merchant vessels and can also work in the shipyards. The following link provides a good idea about this field of engineering- https://engineering.careers360.com/articles/marine-engineering-0

For becoming a successful marine engineer one can do the following courses-

1. BTech in Marine engineering- This is a 4 year course which is run by many maritime colleges in India both government and private. List of colleges along with the fees and entrance exams is given in the following link- https://engineering.careers360.com/colleges/list-of-be-btech-in-marine-engineering-colleges-in-india

2. DME- This is the course of 2 years. Diploma in marine engineering is for those students who have done diploma in mechanical engineering.

3. GME- Graduate Marine Engineer is a course which is done by those who are Mechanical Engineering Graduates.

Some colleges for pursuing GME are-

a) METI, CSL

b) Maritime Foundation, Chennai

c) Samundra Institute , Pune

Now for placement, one needs to posses a sponsorship from a shipping company otherwise it becomes difficult to get a job.

Once a marine engineer (fresher) becomes a chief engineer he/she opens new doors of opportunities of jobs on land. One can become a marine lecturer in any maritime institutes (full time or part time). Again their are many jobs in various shipping companies as Technical Superintendent , Surveyor etc. There are many government jobs also available.

I hope it helps.

Thank you