Two inmates jailed for their part in a riot at Moorlands Prison have failed in a bid to get their sentences reduced.
Adam Mendoza, aged 26, of Mill Street, Rotherham, and Kyle Sherlock, also 26, from Cleveland, were among 15 men jailed over the disturbance in November 2010.
The riot caused £600,000 damage to the jail, near Doncaster.
Inmates had to be moved to other cells across the country.
Mendoza was jailed for 10 years and Sherlock for six, after both were convicted at Sheffield Crown Court in August 2012 of rioting.
Mendoza’s sentence also included a one-year tariff for contempt of court after he made a gesture to his throat and threatened a prison officer who gave evidence against the pair.
The court heard prison officers were pelted with missiles until they were forced to abandon the jail’s House Block on the night of the riot, leaving its 168 inmates in control for six hours.
Fires were set, with flames reaching the prison roof, windows were smashed, and there was deliberate flooding.
One prisoner suffered serious injuries and, after guards eventually regained control, another inmate was found hanged in his cell.
Rejecting the two appeals, Judge Mr Justice Silber said: “The prison officers were unable to protect those prisoners.
“This was a riot of the utmost gravity, with inmates taking control of an entire prison block for six hours with the intention of trying to destroy it.”
He said the trial judge ‘had an obligation to ensure this behaviour was heavily punished’.
Prisoners armed themselves with table legs and threw pool balls at officers during the riot.
A pool table was set on fire and furniture was thrown from landings.