Cold Water Shock: Sudden exposure to deep water causes steep drops in temperature. This triggers a natural panic response that can instantly affect breathing, dramatically reduce physical strength, and paralyze muscle control—even in strong, capable swimmers.

Undercurrents & Drop-offs: Unpredictable, strong undercurrents and sudden changes in depth can drag swimmers under.

Debris & Disease: Submerged structural objects, sharp debris, and hidden aquatic illnesses present serious health and entrapment risks. 

Call 999 Immediately: Ask for the Fire and Rescue Service and provide a clear location (using tools like the what3words app can help).

Shout: Verbally encourage the person to float flat on their back and try to relax their breathing until the shock passes.

Reach: Extend a long object like a branch, stick, or pole from the bank.

Throw: Toss them something that floats, such as a life ring or a plastic bottle.

Don't Go: Never enter the water yourself to attempt a rescue, as you risk becoming a casualty yourself.