In 1934 swimming was introduced to school. At first all practices and training was conducted at S. Thomas’ College Pool at Mt. Lavinia. Later the St. Joseph’s College Pool and the Sinhalese Sports Club Poll were used. Although a pool for the school was suggested in 1935, the school built its swimming pool only in 1968. Since then swimming, diving and water polo have grown in popularity amond the students. The main trophies are the Dr. V.R. Schokman Shield for Schools’ Champions and the Dr. R. L. Hayman Cup for Under 16 Champions at the Sri Lanka Swimming Associations Meet. The J.M. Kersvill Shield is awarded to the overall champions at the Sri Lanka Schools Meet.