The deputy headmaster also became involved in the scheme and allegedly acquired a ninth machine for himself in January, which was also installed at the school. The computer network in the building became overloaded as a result of the mining activity, according to reports, and this "interfered" with teaching. The headmaster was fired in October and his deputy received an official warning. A local authority responsible for "discipline inspection" has claimed the money that was made through the mining activities. "The noise and heat of nine actively running mining machines would have been very noticeable," said Matthew Hickey, a cyber-security expert at Hacker House.

https://www.bbc.com/news/technology-46150107