"She had been tied up and forced to undergo cruel training known as crushing to prepare her to work in the tourist industry.
"We freed her and helped her to recover. She became really close to me and we formed a strong bond.
"I went in the river to show just how remarkable the relationship with humans is. And that if you show warmth and kindness to them, they will treat you well, too."
Kham Lha tries to lift Darrick up by her trunk.
Crushing is a brutal training method where young elephants are tied up and beaten into submission.
The method is used in Thailand's elephant tourism industry to make elephants more subdued and safer for holidaymakers to ride.