It was pretty amazing to witness the elephants crossing the river. First of all they all gathered tovether on the river bank. They eat some grass, spray some mud around and just chill out.
After about forty minutes of this they line up on the river bank, 15 minutes and the 1st elephant kneels down into the mud. Like it was a signal to the others to jump in.
Most of the elephant are in the water within 5 minutes, then they start to swim across. By the time the 1st elephant gets to the other side, the last elephant is in line at the back.
So all 50 elephants reach the other side, only then do the last two elephants get in the water. It was strange, there were 2 elephants that seemed unsure, and only got in the river once every other elephant was on the far bank.