Which technological improvement has allowed modern cave divers to explore further into underwater caves?

The advancement of Diver Propulsion Vehicles (DPVs) has significantly enhanced the capabilities of modern cave divers, enabling them to explore further into underwater caves than ever before. DPVs are underwater scooters that allow divers to efficiently travel long distances with less physical exertion compared to swimming. This technology allows divers to conserve their energy and extend their bottom time, which is crucial when navigating the often extensive and complex environments of underwater cave systems.

The design of DPVs typically includes a propulsion system that enables the diver to move swiftly and effectively through the water, often overcoming the drag of underwater currents and the challenges posed by tight passages. With this enhanced mobility, divers can explore more remote areas of a cave system, conduct thorough mapping and documentation, and respond to emergency situations more effectively.

The other options, while they play important roles in diving, do not fundamentally enhance the ability to explore underwater caves to the same degree. GPS devices, for example, are not effective underwater due to the inability of GPS signals to penetrate water. Traditional scuba tanks are essential for providing breathable air but do not extend dive range or efficiency. Similarly, depth gauges are critical for monitoring depth but do not contribute to mobility or exploration capabilities.

In conclusion, the development and use of DPVs mark