You won’t find salty seas in Switzerland, but alpine lakes and rivers make for unique and mystical scuba diving.
Lake Geneva has a variety of dives to discover. Wall dives and freshwater scenery can be perused beneath the surface. There is even a wreck dive - a stellar spot for more advanced divers to take the plunge.
Another is Lake Zurich, where you can head to excellent scuba spots right from the shore. The lake is serene, with lofty mountains cascading upward from the lakeshore. Glacially fed, the lake has sublime visibility.
River divers will be blown away by the Verzasca, an impossibly clear river found just south of the Alps near the border of Italy.
You can dive in Switzerland's lakes throughout the year as long as you are well-protected. Bear in mind that Switzerland becomes cold in the winter, and if you plan to dive during the colder months you will need a thick wetsuit or dry suit to explore the waters, often remaining only just above freezing.
Fly into any of the major cities, then plan your route from there. There are busses, taxis, and metros to get you around the busy streets. Farther out you would be wise to take a train, giving you the most scenic views of the gorgeous landscapes.