Diving sites and scuba centers in Brazil
Despite these risks, water-filled caves attract cavers and speleologists due to their often unexplored nature, and present divers with a technical diving challenge. Caves often have a wide range of unique physical features, such as stalactites and stalagmites, and can contain unique flora and fauna not found elsewhere.
Visibility can be low, or non-existent. While a less-intensive kind of diving called cavern diving does not take divers beyond the outermost part of the cave reached by natural light, true cave diving can involve penetrations of many thousands of feet, well beyond the reach of sunlight. The level of darkness experienced creates an environment impossible to see in without an artificial form of light. Caves often contain sand, mud, clay, silt, or other sediment that can further reduce underwater visibility in seconds when stirred up.