Look for this

I've worked in the spfx/model business on and off for 30 years and perhaps know a little bit about how much work is required to pull off something spfx-wise that looks at least reasonably convincing.
As a gag, the spfx crew pulled a little gag on the public, and, as a result, I'll never look at this film the same way again.
When the Titanic surfaces and is completely out of water, the camera pans across the deck.....Okay eagle eyes, take a gander at the deck, midway through the ship and you'll see a little something that looks out of place. Upon closer examination you'll see this item is a pair of tiny figures pushing up and down on a hand pump!.......Doubt me? Check it out......One of my spfx friends pointed it out and I've never forgotten it.