The following lists events that happened during 1981 in Singapore. Incumbents President: Benjamin Henry Sheares (until 12 May), Yeoh Ghim Seng (Acting) (12 May to 23 October), C.V. Devan Nair (starting 23 October) Prime Minister: Lee Kuan Yew Events January 25 January and 7 February - Adrian Lim, a self-professed medium, Catherine Tan Mui Choo and Hoe Kah Hong murdered two children as "sacrifices" in a case known as the Toa Payoh ritual murders. This case is the second longest murder trial in Singapore at that time, taking 41 days to complete. The three suspects are found guilty and sentenced to hang. The sentences are carried out on 25 November 1988. March March - Singapore's Permanent Representative to the United Nations, Ambassador Tommy Koh, assumed the presidency of the Third UN Conference on the Law of the Sea. April 15 April – The Vanda Miss Joaquim is declared Singapore's national flower. May 12 May – Singapore's second President Dr Benjamin Henry Sheares dies while in office. Speaker of Parliament Yeoh Ghim Seng temporarily serves as acting president during that time. 22 May – The Government of Singapore Investment Corporation is formed. July 1 July – Changi Airport starts operation. On the same day, the former Paya Lebar Airport is handed over to the Republic of Singapore Air Force (RSAF), forming the Paya Lebar Air Base. The Air Base will also handle spillover traffic and emergencies too. 4 July – The National Crime Prevention Council is officially launched to prevent crime. August 1 August – Nanyang Technological Institute is established to train engineers. 22 August – Changi Airport's second runway starts construction, which will be completed by mid-1984. The rest of Phase 2 will be finished by 1986. September 1 September – The National Computer Board is formed to computerise the Civil Service and make Singapore an IT pioneer. 12 September – The new Singapore General Hospital is officially opened. 26 September – The Benjamin Sheares Bridge is officially opened. The bridge is part of the East Coast Parkway until 2013, when it becomes an arterial road. October 16 October – The National Registration Office (NRO), the Registry of Citizens (ROC), the Registry of Births and Deaths (RBD), the Registry of Societies (ROS), and Martial Arts Control Unit (MACU) merged to form the National Registration Department (NRD). 23 October – C V Devan Nair becomes the third President of Singapore. 31