Anil Ambani-lead Reliance Naval has filed a lawsuit against E&P major, ONGC for wrongfully terminating a deal and invoking bank guarantee. ONGC refused to take the delivery of an eighth vessel under a supply deal of a dozen vessels. Reliance Naval has asked ONGC for a reimbursement of more than $6.6 million, and another $15.46 million as payment for the support vessel.