Never jump into plunge pools. Logs or rocks may be hidden under the surface, and the sudden impact of the extremely cold water can cause temporary paralysis that could lead to drowning. Don't swim anywhere near where the waterfall hits the plunge pool. Churning currents called hydraulics can trap you under water.

Yes, you can go under or behind certain waterfalls, but it is an activity that carries significant safety risks in 2026. Famous examples like Seljalandsfoss in Iceland or the Journey Behind the Falls at Niagara feature maintained, safe paths for tourists. However, "wild" waterfalls are dangerous because the falling water can carry rocks and debris, and the high pressure can cause "foot entrapment" or drowning. Furthermore, the "mist" creates extremely slippery surfaces that lead to frequent falls. In 2026, many parks have restricted "under-waterfall" access due to rising erosion and tourist accidents. If a path is not clearly marked and maintained, you should never attempt to go under a waterfall, as the force of the falling water (even from a small height) can easily overpower a human and cause a fatal accident.