 The first offshore drillship was the "CUSS 1" developed for the Mohole project to drill into the Earth's crust.As of June, 2010, there were over 620 mobile offshore drilling rigs (Jackups, semisubs, drillships, barges) available for service in the competitive rig fleet.One of the world's deepest hubs is currently the Perdido in the Gulf of Mexico, floating in 2,438 meters of water.