And with which equipment would you do that? Are there even submersibles with adequate tooling available in a small enough radius?
I've followed an OceanGate Titanic mission where a popular travel blogger was participating in and from what I understood there aren't many submersible vessels in the world able to go so low, let alone with functionnal tools. It is not like you can open the door to a diver for him to attach a cable, pressure is just too high.