Drove my saab95Aero through some unexpected flood water.Charging warning light on 2000 Saab 9-5

Central warning light came on.Engine temperature guage now in the red.Car check displayed coolant loss.Stopped car.Water under battery cover.Engine wont this a battery failure or drive belt failure or what.
would appreciate any diagnosis help.

Asked by for the 2000 Saab 9-5