Station On WatchVHF Ch 65 | Callsign: Worms Head NCI | Emergency: 999 Coastguard
NCI
NCI Worms HeadNational Coastwatch Institution
NCI Public Safety Advice

Water & Coastal Safety

Essential safety guidance for visitors, swimmers, paddlers, and walkers exploring Rhossili Bay, Worm’s Head, and the surrounding Gower coastline.

1. Cold Water Shock & "Float to Live"

Water temperatures in the Bristol Channel rarely rise above 15°C–16°C, even in mid-summer. Falling unexpectedly into cold water triggers an involuntary gasp reflex and rapid breathing, which can cause you to inhale water and drown.

If you fall into water unexpectedly, Float to Live:

  1. Tilt your head back with your ears submerged.
  2. Relax and try to breathe normally. Fight the urge to thrash or swim.
  3. Move your hands gently to help stay afloat if needed.
  4. Spread your arms and legs to improve stability.
  5. Once your breathing is under control, call for help or swim to safety.

2. Rip Currents & Surf Hazards

Rhossili Bay experiences strong Atlantic swell and complex surf patterns. Powerful rip currents run seaward along the length of the bay, particularly near sandbanks, river outlets, and rocky outcrops like the Spaniard Rocks.

How to Spot a Rip Current

  • Discoloured, sandy, or foamy water heading out to sea.
  • A noticeably calmer gap between incoming lines of breaking waves.
  • Debris or seaweed moving rapidly seaward through the surf line.

If Caught in a Rip Current

  • Do not swim against the current — you will exhaust yourself.
  • Swim parallel to the shore until you are out of the rip.
  • Once clear of the pull, make your way back in toward the beach.
  • If you cannot escape, Float to Live, raise one hand, and shout for help.

3. Tides & Worm’s Head Tidal Causeway

The Bristol Channel has the second-highest tidal range in the world (over 10 metres on spring tides). Water moves exceptionally fast across shallow causeways and sandflats.

Crossing to Worm's Head

The tidal causeway to Worm's Head is only open for approximately 2.5 hours either side of low water.

  • Check tide times before you set off at the NCI Lookout, the National Trust Visitor Centre, or online.
  • Never attempt to cross or return once water begins washing over the causeway. Currents in the Sound are fierce, and multiple rescues occur every year due to late crossings.
  • If stranded on Worm's Head, stay put and call 999 (Coastguard) or alert NCI Rhossili. Do not attempt to swim across the Sound.

4. Activity-Specific Advice

SUP & Sea Kayaking

  • Wear a buoyancy aid / PFD and the correct leash (quick-release waist leash for tidal/moving water).
  • Carry a waterproof VHF or mobile phone in a lanyard pouch.
  • Never paddle in strong offshore winds (winds blowing from land out to sea).
  • Always check local weather and tidal stream forecasts before launching.

Coastal Swimming

  • Swim with a buddy and use a bright tow float and hi-vis swim cap.
  • Enter the water slowly to acclimatise and avoid cold water shock.
  • Stay within your depth and close to shore. Avoid swimming around outer headlands where tidal races run.
  • Check conditions: avoid swimming in heavy shore-dump waves or murky water.

Angling & Coasteering

  • Watch out for rogue swell waves on exposed rock platforms around Worm's Sound and Fall Bay.
  • Wear sturdy footwear with good grip on wet rock and kelp.
  • Always wear an auto-inflating lifejacket or impact vest when fishing from low ledges.
  • Tell someone on shore your planned location and estimated return time.

5. Offshore Winds & Inflatables Hazard

Beach inflatables (dinghies, flamingos, toys) are designed for swimming pools, not open coastal waters.

Rhossili's prevailing easterly or north-easterly breezes can look calm at the base of the cliffs, but will blow an inflatable miles out into the Bristol Channel within minutes. Do not use toy inflatables at Rhossili Bay.

6. Marine Communications & VHF Checks

NCI Rhossili operates as a declared facility for maritime search and rescue under HM Coastguard. We maintain a listening watch on VHF Channel 65 during station operational hours.

Radio Checks

Vessels and small craft are welcome to call "Rhossili NCI" on VHF Ch 65 for a radio check and to receive local weather, sea state, and barometric pressure updates.

Visual Watch

Our watchkeepers monitor water users across Rhossili Bay, the Worm's Head causeway, and the outer Sound. If you see someone in difficulty, report it immediately.