What will i have to do if i want to join indian navy after completing degree in mechanical engineering?

Technical entry is there , that is through the college. Navy comes in college , conducts the exam and then take graduates from there. Else you have to go through UPSC-CDS.

Officer’s recruitment is advertised through Employment News and all important national and regional newspapers/dailies. Selection for Permanent Commission through NDA/NA cadet entry and CDSE (Graduate) entry is through a written examination conducted by UPSC, followed by an interview by the Service Selection Board (SSB). For all other Permanent Commission entries and Short Service Commission entries there is no written examination. Applicants are short-listed as per criteria laid down by the Naval Headquarters, (Directorate of Manpower Planning & Recruitment). Selection is through merit alone. The details are enumerated as follows:-

Induction of officers in the various Branches of the Indian Navy is undertaken through one of the following modes or schemes:-

• Union Public Service Commission (UPSC) entries
• Direct Entry Permanent Commission /Short Service Commission
• University Entry Scheme (UES)

It is mandatory that all degrees and educational qualifications are from Educational Institutions recognized by the competent authority in the field. Degrees/mark sheets must be original or self attested, as asked for in the advertisement. No compromise/relaxation will be made on this issue. All candidates desirous of joining the Indian Navy must be physically/mentally fit as per laid down standards. Proficiency in sports, swimming and extra-curricular activities is desirable.

You can refer this link :

https://www.joinindiannavy.gov.in/en/page/selection-procedure.html