Which factor can make surfacing undesirable for divers?

Surfacing can be particularly undesirable for divers in strong currents. When currents are powerful, they can quickly carry a diver away from their intended exit point or boat, increasing the risk of disorientation and making it difficult to return to safety. Moreover, strong currents can lead to complications such as increased air consumption and can challenge the diver's ability to orient themselves and maintain control during ascent.

In contrast, calm water conditions, clear visibility, and high temperatures typically contribute to a safer and more manageable surfacing experience. Calm water allows for a smoother ascent, while clear visibility can aid divers in navigating their surroundings, and high temperatures often enhance overall comfort during diving sessions. Therefore, strong currents present a specific challenge that makes surfacing a more critical and potentially dangerous process for divers.