Why didn't they film onboard the Lane Victory?

The Lane Victory is a former U.S. Merchant Marine craft that is stationed at the Port of Los Angeles and is frequently used for filming, most famously in James Cameron's 1997 blockbuster "Titanic."
It actually can still set sail.
I believe "Titanic" used it to get the ship's wake right. But it doesn't seem to be expensive to rent; Triedstone Pictures (whose website is just a youtube channel w/no other HTML) filmed on it.
Look on IMDb and see that Triedstone Pictures isn't listed; it's only done web shorts.
It would be perfect for filming the sea go by (if needed) and also the machinery spaces (I think Titanic did this w/some green screen) and crew-only hallways such as in the last part of the film.
No concrete walls there! But even if they filmed the halls on dry land, they could have covered the concrete w/green screen material and composited in metal walls.
Heck, knock together some wooden frames cover them paper or cloth and paint them battleship grey... or white ... or whatever.
btw, a better idea for jumping over the puddle is have the lead guy knock out the pins of a wooden door with female lead's assistance, then carry the door (as if it's very heavy) to the puddle, toss it in such that there's water on each side.
The door is at an angle because the doorknob is still on (couldn't find the right tools). Lead male can jump on and cross w/no slipping because of shoes, lead female jumps on and starts to slide off. Man stretches self by putting one foot on door and holding out hand. Female grasps it and gets to edge of door where male says "Jump!" female anxious, scared. "I'm afraid!" Male says "Jump! I'll catch you!!" She does, he pulls his arm and her to his torso, and swivels away from water whereupon they both fall down (him top, rugged arms wrapped around her to save her from injury). They both get up and scramble further down the hallway.
That's the way I'd do it.