Things I learned after watching this - SPOILERS
Wow, what a let down. After reading reviews and synopsis, I thought this would be good but it was horribly stupid.
1. Even though the Navy has an open purse to fight the war on terror, don't use a new ship for black ops interrogation - get one that's 60 years old and could break down any second.
2. Make sure that the ship's engineer has absolutely no tools to fix it.
3. Always do your interrogations near Iranian territorial waters - if the ship breaks down (remember the ship's engineer doesn't even have a screwdriver) it won't drift into their space.
4. Even though the Navy has a huge budget, they can't afford light bulbs. This makes it easier for the ghost to kill people.
5. Old radios can still pick up Nazi broadcasts.
6. Even though you are an elite anti-terror squad, always drop your weapons and engage in hand-to-hand combat.
7. Never radio for help even if 3/4 of your team is has just been killed by a monster ghost.
8. Always enter a room and turn your back immediately when a killer is on the loose.
9. Even though C-4 charges are in place to sink the ship, don't get in a lifeboat and blow up the ship to sink it like you had planned, grab a 480V wire, drag this wire around the ship and try to electrocute the ghost - don't worry if you or the other two survivors die along the way.
10. Finally, like all lame horror movies, NEVER stay in a group so you can have strength in numbers. Always split up and have everyone go alone in different directions so it's easier for the killer.