Water immersed in z1 topic

Mi and my friend inserted our z1 and z in a fish tank playing a video but after a minute or two both phones stopped working and turned off and since then not starting.
When connected to charger it shuts down continuously and when we opened the flaps there was water in it..our flaps were intact still somehow the water got in and don't know how...!
Now we sent them for a repair.
Can somebody please tell what will charges and what can be the damage:(