The instruction by the Minister of State for Shipping was given after he took stock of the situation at the shipyard today.
"The minister instructed CSL to conduct a thorough investigation and find out the root cause and report the details to Ministry of Shipping," CSL said in a statement.
The statement said the minister took stock of the situation on board 'Sagar Bhushan', the ONGC Rig where the fire claimed 5 lives.
During the interaction with the unions and associations, Radhakrishnan as well as CSL CMD Madhu S Nair promised adequate support to all the affected families, it added.
CSL has announced an immediate compensation of Rs 10 lakh to the bereaved families.