Umm...something went wrong here...
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As you can see here, 183 million spent on ship maintenance. The game also crashed on the next turn. Autosave was not loadable.

And this is a picture of my fleet log from the previousautosave file. Clearly prior to the bug, but I also did not produce a ship on the turn it occured. My treasury is also substantially higher (39k bc)

And this is a picture of my fleet log from the previousautosave file. Clearly prior to the bug, but I also did not produce a ship on the turn it occured. My treasury is also substantially higher (39k bc)