There is a forum message relating to him which states "HMS Triumph (a submarine) was lost somewhere in the Aegean Sea in January 1942. No-one knows her position. She went down with all hands onboard including 2 Commando's, Corporals Clive Severn & Alfred Child. Both are listed as serving with 1 SBS." The official forms are also posted there and state "Presumed killed in action."
View the forum message: Corporals Clive Severn and Alfred Child - HMS Triumph (N18).