Death by Drowning is Torture.
It is one of the slowest cruelest deaths. It is not quick, it is by no means painless and it is not what humane people do. If you have ever had a hard time catching your breath or held your breath until your lungs felt as though they would burst, imagine that but without any relief available.
This is not about killing. Dogs are euthanized every day. This is about wanton, sick cruelty.