These events helped to launch him into the diving world.
Lavanchy was active in Glaukos, the oldest diving club in Switzerland, serving throughout the years as Vice President, President, Secretary, Head of the technical committee. He was the Club’s delegate in the Swiss Diving Federation, worked in the Technical Commission and attended most of the CMAS General Assemblies. Lavanchy was a fervent supporter of simplicity and safety in teaching methods, and supported the development of the CMAS Scientific Commission.