If you liked the original "Poseidon Adventure" then you can not find one redeeming feature of this lamebrained "sequel" that represents exploitation for a quick buck at it's worst. Paul Gallico's novel, while not stellar, at least brought back Rogo, Martin and Manny Rosen while this time out the orignal cast and characters is gone completely apart from an obscure reference to the helicopter that picks them up.
I won't bother dissecting the horrible performances by the actors in their uninteresting roles. I would like to gleefully note the absurdities of the entire plot when compared to it's predecessor. As two others have noted, it is impossible to believe that there could be no other rescue ships out to the scene at this point. And did anyone else notice how the ship seems strangely much more intact than it did in the original? Fred Koenekamp's cinematography in the original was dark, grimy, realistic and effective. This time out, this search crew ends up back in a spotless looking kitchen which in the original was devastated by a flash fire and then submerged only moments later! The photography is much too bright, the settings too spotless, and the story just plain stupid. The bigger mystery is why, after being humiliated in "The Swarm" did Michael Cain ever agree to work with Allen again?
Pretend this film never happened and just stick to the original, which is far more intelligent.