So keep it up lol.
How is this possible that we can see photos from inside a Navy Drydock of war damage to a ship from new technology deployed this year. What an intel bonanza to improve the ship killing ability of Ukraines drones.
Ordinary people can become James Bond for a moment. They have better and faster-evolving technology in their hands than the whole of Q Branch and the Russians can't stop it. The person who took this could have been shot. Internet Points Bond, I salute you, whoever you are. Brass cojones.
I'm going to guess they cut around the damaged area and weld a new plate into position.
They might weld backing plates across the join between the new plate and the existing hull, then fill the gap with more welding.
Similar to how you fix a hole in plasterboard. Just bigger, heavier, and weldier.
Certainly not an easy thing to do. There will be bulkheads in the inside, wiring and plumbing, all sorts of things.