This is a much more detailed look at the sinking of the Ursa Major, including how the vessel sunk and what it was doing at the time of the sinking.
An explosion in the engine room apparently, and she sunk stern first, indicating there was a lot of water coming into that area of the ship.
Okay this must be sabotage or something? Pretty big coincidence to have so many so quickly.
I think the first 2 at least were very unlikely to be sabotage. They were reconstructed, and the welding from that was not strong enough for the task.
Of course sabotage is a possibility, but Russia is driving everything beyond their limits. Even workers are demanded to work insane hours where shortage is worst.
Russia is destroying itself from the inside. If they get a little help from Ukrainian sabotage, it only means it will go a bit faster.
But Russian infrastructure is collapsing because it’s poorly maintained and pushed beyond limits.
Never attribute to malice that which is adequately explained by stupidity. Or by incompetence. Or by neglect. Or by corruption. Or by vodka.
All those things existed before. Perhaps something changed in their ship maintaining routine to cut costs.
I’d like to highlight the Admiral Kuznetsov. Here’s my personal favorite from the wiki page