Murray River short neck floating on one side

[Ethianh]

I have a murray river short neck that had very recently began floating at the top of the water and on one side. The turtle is about 8 years old. The turtle seems very confused and scared. When he extends his neck it is also on an angle. He has another Murray river turtle in the tank as well. I have moved him to a temporary container.
View attachment IMG_3416.mov