Accompanied by second mate Wilbur and passenger Celeste Whitman, Turner heads out to claim salvage rights, as the tugboat Jenny lost its cargo in the same tsunami that capsized the Poseidon.

They board the vessel through the bottom hull opening by the French rescue team and come across the fires still raging in the engine room and the body of Linda Rogo.

The group soon encounters more survivors, the ship's nurse, Gina Rowe and two passengers, Suzanne Constantine and war veteran Frank Mazzetti, who is searching for his missing daughter Theresa.

Theresa is found, as are elevator operator Larry Simpson and Tex, a supposed billionaire who clings to a valuable bottle of wine.

Turner's group find the purser's office, where Svevo decides that he and his men will search for other survivors, parting ways with the rest.

Another explosion causes the safe in the purser's office to fall and open, revealing gold coins, diamonds and cash.

Svevo reveals that his real intention for boarding the Poseidon was to retrieve his lost shipment of plutonium, adding that he cannot let Turner and his group go now.

Tex, who in reality was not a wealthy passenger but a sommelier from the Poseidon's crew, holds onto his bottle as he is gunned down and perishes.

Water continues to flood the Poseidon, causing the boilers and then the plutonium cargo to erupt, exploding the ship's hull and sinking it stern first.

In 1973, soon after the first film came out, producer Irwin Allen proposed a sequel that would have had the survivors testifying in a hearing on the disaster in Austria, the country of the Poseidon's parent company.

For the year prior, the ship interior set was designed and built, based on the RMS Queen Mary.

[3] Janet Maslin of The New York Times wrote that Irwin Allen "is so obviously ill-equipped to stage action scenes in cramped quarters that his audience winds up wishing as fervently as his characters for a chance to see the light of day".

The sequel is painstakingly crafted and pleasant to watch but seems routine and even tedious at times, mainly because there has been so much razzle-dazzle on the screen since the S.S. Poseidon capsized—including, of course, Allen's own Towering Inferno".

Factory re-released Beyond the Poseidon Adventure on Blu-Ray, as part of the Irwin Allen: Master of Disaster Collection which additionally included the original extended cut which aired on television.