Deep Rising - (Sci Fi / Horror) - 1998

A group of heavily armed hijackers board a luxury ocean liner in the South Pacific Ocean to loot it. They find the passengers are missing,and evidence of large scale destruction .The hijackers come to realise someone or something else has got there first, and has attacked the liner. As they search the decks,they discover, a monstrous tentacled, man-eating sea creature, has taken over the ship and is on the hunt for more prey, and they are it.
Now it's a battle for survival