In Metal Gear Solid 2: Sons of Liberty, the tanker hijacked at the beginning of the game is called Discovery.
The Discovery is a U.S. Marine Corps tanker carrying the new Metal Gear RAY prototype. Solid Snake infiltrates the vessel during the opening chapter to investigate the weapon and gather evidence about its development. The tanker mission establishes the game’s themes of military technology, secrecy, and competing interpretations of Snake’s legacy.
The vessel is hijacked by Russian forces led by Sergei Gurlukovich. Revolver Ocelot later betrays the group, steals Metal Gear RAY, and causes the tanker to sink. Snake is blamed for the incident, which helps create the cover story surrounding the later Big Shell chapter.
Discovery is easy to confuse with Arsenal Gear, which is the enormous fortress featured later, or the Big Shell, the offshore cleanup facility where Raiden’s main mission occurs. They are separate locations in the game’s structure and plot.