union of india is industructible

In Shamsheer Singh v/s. Union of India, (1975)ISCR814; AIR 1974 SC 2192: Judgement quoted Dr.Br.BR Ambedkar stated on the floor of Constituent Assembly:'that the constitution of India is both unitary as well as Federal according to the requirements of time and circumstances. The Union of India is indestructible and democratic government and federal functional mechanism are the basic features(referred again in SR Bommai,1994(3) SCC = AIR 1994 SC 1918.