The Tec 50 course completes your training as an entry-level tec diver, taking you past the limits of recreational diving. What You'll Learn during the Tec 50 course includes, making actual decompression dives as deep as 50 metres/165 feet; using enriched air nitrox and/or oxygen for decompression; using desk top decompression software to create custom dive tables and plan your dives; qualifying to make technical decompression dives independently.