Cave diving courses are designed to prepare divers for the rigors of the underwater cave environment and to establish an appreciation of its subtle dangers. This is the Guideline Device Series with GUE Instructor Mark Messersmith. This course will introduce divers to the types of devices used in cave diving: you'll learn about different types of cave line, we'll cover spools, reels, and when to use a primary reel as well as line markers and what Ts, Jumps, and Gaps are. This is a perfect pre-study for a cave or cavern class, or just a handy way for any level diver or even non-divers to learn about cave diving. Buy the full Cave Skills Series for underwater cave skills demonstrations.