Prime Minister Harold Holt disappeared at Cheviot Beach, Victoria on 17 December 1967.

The day before his disappearance Holt was playing tennis with friends in Portsea and a number of them later told police that he seemed to be in pain.

This clip from The Harold Holt Mystery (Ten Network, 1985) includes interviews with two eyewitnesses at Cheviot Beach on 17 December 1967, the day that Harold Holt disappeared.

A Cinesound Review newsreel story about the first - and only - federal election fought by Harold Holt when he was prime minister. The election took place on 26 November 1966.

In this Nine News footage from 1967, Opposition Leader Gough Whitlam extends his condolences to Harold Holt's wife and family.

Harold Holt loved the ocean, and enjoyed being portrayed as an active and adventurous prime minister.

This aerial footage of the Mornington Peninsula, at the mouth of Port Phillip Bay from Portsea to Sorrento, illustrates what a wild piece of coastline it is.

Tony Eggleton was Prime Minister Harold Holt's Press Secretary and close adviser. He was called upon to explain Holt's disappearance during nationally televised press conferences.

Radio and television carried news of Harold Holt’s disappearance on 17 December 1967. This clip is from the documentaryThe Harold Holt Mystery (Ten Network, 1985).

Is Harold Holt still alive? Did he commit suicide? Was he drunk or drugged? Did he secretly belong to a crime syndicate? Was he a Chinese Communist spy?