More than 800 people are employed at the 200-acre Rolls-Royce site at Ansty, near Coventry.
The factory handles the refit and repair of their aeroplane and marine engines. The company's Trent series of civil aviation engines components are also manufactured on the site.
More top news
The Judge said "no sentence I can pass will ever feel like enough for this family."
The pool in Birmingham has been temporarily closed after a bug which can cause diarrhoea, vomiting and low-grade fever entered the water.
The three men were arrested by West Midlands Police counter terrorism officers and are due before Westminster Magistrates' Court in London.