Maybe 100 survivors? So 400 dead or hospitalized.
First of about 400...
“First fatality from Moskva cruiser identified via social media as midshipman Ivan Vakhrushev “
https://twitter.com/Liveuamap/status/1515431102386782208
When the Neptune detonated the magazine it probably took out most of her crew instantly. I’m surprised she didn’t go straight to the bottom like the HMS Hood.