Could you please give us some advice, I keep trying the ladder which has a lock in the boat but I can't use the key on it while I'm underwater. Any assistance would be really appreciated!
do you have a rusty hammer?
The key isn't for that padlock. Make sure you got the rusty hammer and use it to break open the lock. Once you have the hatch open, you can climb out and use the key on the door at the top of the stairs.