r charter hire of 1 (one) no. anchor moored drillship or semi-submersible drilling unit along with equipment and marine logistics for drilling, testing and abandonment of exploratory wells in water depths up to 500 m with drilling depth capability up to minimum 5,000 m in the east coast of india for a period of 14 (fourteen) months, extendable by another 07 (seven) months - 03 (three) firm wells and 01 (one) optional well.