The submarine that was "sold" is not named but appears to be B-400, a Foxtrot-class sub that was built in 1967 and in commission at least as late as 1991. The interior shots likely are INS Kursura (S20), a Foxtrot sold to India in 1961 and now preserved as a museum ship.
When they show one of the federal agents agency they spell "US Marshall". This is incorrect as the agency is actually US Marshal with one "l" this is a frequent mistake. Two "l's" indicate a persons last name and one "l" is the law enforcement official.