hi,

see after passing diploma course, you may join btech course on safety engineering. which will be 3 years course. fees will be like 40,000 -50,000 per semester for private engineering colleges. however if you want to do some job oriented short term courses, then I would suggest you to go for MSME tool room kolkata or central tool room bhubaneswar or any other similar institute which offers 6 month to 1 year courses on machine design, production tool design courses. fees varies as per the duration of courses. also there is placement opportunities.