TDS Barge Drilling Rig 21 is a 24-hour inland bay barge drilling rig constructed in 2005, rated to 30,000 feet with a 2,000,000-lb hook load. Powered by Continental EMSCO C-3 Type 2 drawworks and a Canrig 750-ton top drive, Rig 21 is equipped for deep-shelf barge drilling in the Gulf Coast transition zone and shallow water environments worldwide.