Elementals #13 (1990)

Continuation of the Oblivion War as Fathom and Thor meet their engagements. Thor travels to Tibet and finds three giant alien guards, already beaten. He goes in search of the superhuman who was so victorious in hopes of recruiting him...only he ends up wishing he had never found him!   Fathom dives deep into the waters off the Cayman Islands. She finds hundred of dead dolphins and gets swallowed whole by a huge demonic fish creature. The insides of the creature have a paralyzing effect. With the help of a paranormal were-dolphin, they devise a plan in which Fathom soaks in as much water to her form as she can until the demon fish bursts!