Operation Cover-up is the name of the security measure used on Tracy Island.
Just prior to the arrival of non-International Rescue-affiliated visitors to the island, Operation Cover-up swings into action. The video screens which connect the island's base with each Thunderbird craft normally show a portrait of its pilot in International Rescue uniform. But the push of a button replaces the portraits with innocuous family snapshots.
Operation Cover-up was used in:
- Trapped in the Sky, when the family doctor arrived to see Kyrano
- End Of The Road, when Eddie Houseman comes to visit Tin-Tin Kyrano
- Edge Of Impact, when Colonel Tim Casey pays an unexpected visit to his old friend Jeff Tracy
- The Impostors, when a Colonel inspects the island looking for the crooks who stole the plans for the AL4.
- The button that activates Operation Cover-up is situated in the side of one of Jeff's yellow sofas.
- In Trapped in the Sky, it is activated by Jeff. In Edge of Impact, Scott pushes the button.
- As can be seen above, the side-of-the-sofa prop in Trapped in the Sky looks different from the one in Edge of Impact.
- Operation Cover-up also appeared to be in use on two occasions in Operation Crash-Dive, even though there was no overt reason for it.
- This also occurred in The Mighty Atom. While Lady Penelope and the Tracys were enjoying themselves, out on the verandah, the Operation Cover-up portraits could be seen on the wall in the lounge behind them.