Even in Switzerland it can be very interesting to dive. Watch the following descriptions:

bulletTessin (Italian part of Switzerland), Valle Verzasca

A cristal clear mountain river with up to 15m of water and a great visibility.

 

bullet2. The Geneva Lake It is all year long very cold and it is wise to dive dry. Soon I will take some photos of the famous steam-ship wreck "L'hirondlle" which is between 46 and 61 m just in front of the Nestlé headquarters at Vevey. Mainly on the french side you can find some crabs.
bullet3. The Lake Retaud at "Les Diablerets"

Great for diving with frogs but only 5m deep.