I'm actually watching 'Beyond The Poseidon Adventure' atm about 2/3 of the way through- its a 'part 2' made in 1979 from the original nearly a decade earlier- as you may imagine, its pretty corny all round (its got Michael Caine, Telly Savalas and Sally Fields in it)
en.wikipedia.org
Ironically- its plot sounds almost exactly what 'certain parties' would have us believe happened to the Estonia- the plot of a 'B grade' movie (and thats being generous indeed....)
Even down to the radioactive plutonium being smuggled aboard, and the French Coastguard trying to keep all and sundry away, while unknown armed men attack the crew onboard...
All its missing to date is the tracked submarine lol