THIEVES siphoned 500 litres of diesel from buses parked at the Solent Blue Line depot in the Waterside.
The fuel, worth about £500, was siphoned from five buses at the Newlands Road site in Fawley.
Damage was also caused to the depot's electronic fuel pump and several storage units.
The theft happened between 12.40am and 1.20am on June 14 after the compound fencing was cut.
Anyone with any information can contact PC Adrian Woodhead at Hythe police station on 0845 045 4545 or Crimestoppers anonymously on 0800 555 111
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