Well, no need for an investigation then. You have taken very spotty and limited information and reached the predetermined conclusion. Rig a yardarm on the remains of the mast and start launching the guilty into eternity beginning with the Captain. Bravo Zulu.
It ain’t rocket science sport. During construction which is a high risk operation, and when the fire suppression system was offline, try had insufficient fire watch and fire response. And the hatches were wide open from stem to stern allowing fire to spread, and firefighting water to flood everywhere.
It’s pretty obvious that ship is done for. Due to incompetence.
But the crew will have a fabulous rainbow tranny wake party for her.