The Ocean liner is the big Bag they put around the shoreline to help make sure the Ocean does not Leak. If the Ocean Leaked then Bad things would happen, like all the sweet juicy Magma inside would Dry up from all the Salt and Everyone would be Sad.

Sharks that like to Chew on Fiber optic cable often take little Bites out of the Ocean liner, requiring Divers to carefully Sew the Ocean liner back together, so that all of the Magma is Safe.