The Ursa tension leg platform is an oil platform with a tension leg structure located at 28.15403°N, -89.10355°W about 130 mi southeast of New Orleans in the Gulf of Mexico. It is operated by Shell. It has a total height from the seabed to its top of 4285 ft. Shell is the operator of the project with 45.39%. BP has 22.69% while ExxonMobil and ConocoPhillips each have 15.96%. The discovery well was drilled in 1991, with Sonat's Discoverer Seven Seas drillship, on Mississippi Canyon block 854. Construction was finished in 1998. The Ursa Tension Leg Platform was replaced as the tallest man-made structure in the world by the Magnolia Tension-leg Platform.