What is a major danger of swimming against a current in a cavern?

Swimming against a current in a cavern significantly increases fatigue and can lead to disorientation. When divers attempt to swim upstream against a current, they expend more energy, which can quickly lead to exhaustion. In a cavern environment where conditions may already be challenging—such as reduced light, limited space, and potential obstacles—this fatigue can compromise a diver's ability to navigate safely.

Moreover, as divers become fatigued, their physical and mental faculties can decline, making it harder to make sound decisions or maintain orientation within the cave system. The risk of disorientation is heightened because the diver may struggle to assess their surroundings accurately as they tire, potentially leading to a hazardous situation where they could become lost. This combination of increased fatigue and the risk of disorientation underscores why swimming against a current poses significant dangers in cavern diving.