Anyone taking up scuba diving for the first time should know the number of differences between diving in freshwater and saltwater conditions. Rivers, lakes, quarries, and springs are freshwater areas, while the ocean is obviously comprised of saltwater. To an inexperienced individual, scuba diving in saltwater may not seem all that different from freshwater explorations. However, freshwater and saltwater diving is actually quite different in a variety of aspects, from the slight changes in the scuba gear to the overall diving experience.
Another major difference between the two is the temperature. Freshwater sites like springs, lakes, and quarries are a lot colder than seawater. Thermocline, which is the distinctive drop of temperature in a body of water, is more evident in freshwater conditions. The abrupt change of temperature can make the dive more difficult since colder water can cause a lot of stress to the body. The colder you get, the more energy your body expends to maintain core temperature. Consequently, you consume more oxygen to gain energy, which makes the diving period in freshwater relatively shorter compared to saltwater.
Current is also different when it comes to freshwater and saltwater. Water current in oceans is a lot harder to notice or predict. River currents, on the other hand, are quite obvious from the surface, whereas lakes practically have no noticeable current at all. But because ocean currents are more unpredictable and a lot stronger, getting caught in an ocean current can be a challenging experience.