Final answer:
Before diving in currents greater than 1 knot, divers must plan carefully, taking into account current strength, using dive flags or floats, and having proper safety equipment. They should always heed 'no diving' signs and be well-versed in buoyancy and pressure equalization to prevent injuries like decompression sickness.
Step-by-step explanation:
When scuba diving in waters with currents greater than 1 knot, a diver must be well-prepared and take certain precautions before diving. First and foremost, assessing the strength of the current is critical to understanding the conditions under which the dive will take place. This involves planning the dive to accommodate the current's direction and strength, which can greatly affect navigation and safety.
It is also essential to discuss with a local guide or experienced divers who are familiar with the area's conditions. Furthermore, utilizing a dive flag or float can significantly enhance safety by indicating the diver's position. When currents are strong, divers should consider using a reel and line to stay connected to the dive boat or entry point. Divers should also be equipped with an appropriate exposure suit, signaling devices for safety, and possibly a surface marker buoy to remain visible at all times.
It's crucial that divers heed any warnings or signs indicating no diving is allowed. These warnings are often in place due to dangerous conditions, such as strong currents or shallow water. Moreover, knowledge of buoyancy control and pressure equalization techniques is essential to ensure a safe dive and to avoid the risks associated with rapid changes in pressure, such as decompression sickness (DCS). If a diver experiences DCS, they may require treatment with hyperbaric oxygen therapy in a decompression chamber.