Kanuni (ex NS37/ Sertão) is a Turkey-flagged sixth-generation ultra deepwater drillship owned and operated by the Turkish Petroleum Corporation.

The ship was built in three years by Samsung Heavy Industries, Geoje, South Korea, and finished in 2012,[4][5][6][7][8][9] and christened Sertão.

[9] Owned by Schahin Petroleum Gas in Rio de Janeiro, Brazil, and flagged Marshall Islands with home port Majuro,[7] she served for the Brazilian state-owned Petrobras between 2012 and 2015.

[7] After the vessel was idled and warm stacked for nearly two years, the Admiralty Marshal of the United Kingdom opened a request for tender in mid January 2020 that was run by the broker CW Kellock & Co. Ltd.[12] The state-owned Turkish Petroleum Corporation, TPAO acquired the drillship for US$37.5 million winning the bidding.

[5][8][10] Renamed Kanuni, she arrived in the territorial waters of Turkey in Eastern Mediterranean on 13 March 2020 after her 18-day journey departing from Port Talbot in Wales, United Kingdom.