The crew was preparing their next position shooting a feature film on a river in the far jungle, when a wooden boardwalk collapsed, dropping them down to the water, with my camera for about 5 seconds.
What expectations can I have about it? The camera was ON, after an entire day of shooting. They removed the battery quickly but, at that time, the camera was draining water.
What effects does it have on the hot sensor and internal components?
The camera is on the way now and I'll receive it tonight.
The issue with water isn't that it touched a sensor or camera that was too hot and cooled it down quickly. Electronics can fair decently in water if there was no electricity present and the electronics had a fair time to dry.
When there is electricity available from, say, a battery, then you have the possibility of shorting out components. Damage may not be visually apparent as the areas prone to damage are the microscopic components inside IC chips and processors.
I would say, leave the camera in a sealed container with bags of desiccant for a minimum of 72 hours, and then visually inspect and clean components from any dirt/dust deposits before trying to power it on. If the camera has survived, then I would disconnect from power and begin to clean the sensor, boards, and body from any possible dirt and debris more thoroughly.