One young man told the inquiry: "I did not know what was happening.
"Looking back at it now, it does not feel real. It feels like some sort of nightmare.
"It was not a safe place. It was not a treatment room. I got no assessment or treatment done.
"There was no care. I was just put in this room and I lay there and went to sleep."
Another had his arm broken in a restraint, according to his mother. "His arm was wrenched up behind his back until the bone snapped. He was not then taken to accident and emergency for 24 hours even though his arm was completely swollen," she said.
Another mother said her son had been kept in isolation for up to nine hours at a time.
"The rule was that he could not leave until he was quiet," she told the inquiry.
"With his anxiety and sensory presentation, there was no way this was possible.
"He started to bang his head against the wall and would bite the wood in the doorframe out of desperation."
