On 10 April 1973 Invicta International Airways Flight 435 was a Vickers Vanguard 952, flying from Bristol Lulsgate to Basel-Mulhouse that ploughed into a snowy, forested hillside near Hochwald, Switzerland. It somersaulted and broke up, killing 108 with 37 survivors. To date, this accident is the deadliest accident involving a Vickers Vanguard and the deadliest aviation accident to occur on Swiss soil.