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Leon Thevenin.jpg

The Léon Thévenin is a French cable-laying vessel named in honor of French engineer Léon Charles Thévenin.

The Léon Thévenin was famously used in conjunction with a robot submarine named Scarab for recovering the flight data recorder (FDR) and cockpit voice recorder (CVR) boxes from Air India Flight 182 that was destroyed in mid-air by a bomb as it was crossing Irish airspace, on 23 June 1985.

By 4 July, the Guardline Locator equipment had detected signals on the seabed and on 9 July the CVR was pin-pointed and raised to the surface by the Scarab. The next day the FDR was located and recovered.