Embarrassed firefighters had to call 999 (UK's Emergency #) when they got stuck in a lift for half an hour.
Chris Rogers, Richard Furse and Lawrence Mackrell were fitting smoke alarms in flats when it broke down.
A crew from Portsmouth had no idea who was trapped and turned up to find a tender from nearby Southsea outside.
Watch manager Craig Sadler said: "I admit I had a wry smile. It certainly won't be forgotten."