Later during the Cataclysm, it brought diving teams to Vashj'ir.
During the Pandaria Campaign, the Lion's Mane played a very large role for the Alliance. It helped assault Garrosh'ar Point in The Jade Forest, then went to Lion's Landing in Krasarang Wilds a few months later, and later escorted troops to the Isle of Thunder. After the fall of Lei Shen, the Lion's Mane returned to Stormwind City, and then helped fight against the True Horde's fleet during the Siege of Orgrimmar, which ended with Garrosh Hellscream being defeated and taken into custody by Taran Zhu.
During the events on alternate Draenor, Archmage Khadgar and several other Alliance mages teleported the Lion's Mane from Stormwind to the Lunfarfall Shipyard in Shadowmoon Valley so that it could help out the Alliance fleet. Once it had been teleported, several of its cannons and other weapon systems were upgraded and it's supplies were restocked, and then it helped the Alliance fleet by fighting Horde and Iron Horde vessels across Draenor's seas.
Following the defeat of the Burning Legion on Draenor, the Lion's Mane was teleported back to Stormwind Harbor. When the Legion invaded Azeroth once more, the Lion's Mane was among the many ships that assaulted the Broken Shore. The Lion's Mane finally met its end at the chaotic battle, torn apart by dozens of demons.