4Hours
Advanced Diver
15
5
Just a short distance from the dramatic cliffs of Dún Aengus lies one of the Aran Islands’ most fascinating natural features the Wormhole (Poll na bPéist). This perfectly rectangular tidal pool, carved into the ancient limestone of Inis Mór, is often described as a true wonder of the world. Its mystery and power have made it one of Ireland’s most remarkable dive sites.
The Wormhole is a tidal pool measuring roughly 30 metres long by 10 metres wide, with a depth that remains uncertain, adding to its allure.
Its name may come from stories of sea serpents (possibly basking sharks) trapped between tides, or from the powerful water surges that puff upward through cracks in the rock, resembling the spout of a whale.
Diving the Wormhole is a rare and special experience, dependent on tide, weather, and diver readiness. Availability is limited and dives must be booked in advance.
Because of its unique nature, Wormhole diving is for advanced certified divers only. You’ll need:
If you’re not quite there yet, don’t worry, our Scuba Courses can help you build the skills and experience to dive this spectacular site in the future.
Check-In
Arrive at Dive Aran by 08:00. You’ll be greeted by our team and given a gear box and changing space.
Dive Briefind
A briefing will take place approximately 20 minutes before we depart the dive centre.
Boat Departure
A boat will depart from the front of the dive center at 09:00.
Scuba Diving
Dive time is 45 min.
Boat Return
The boat ride typically lasts 25 minutes each way, with a return time of approximately 2-3 hours after departure.
Check-Out
Around 12:00
Got the Question? We've got answers
No, The Wormhole Diving is for certified divers only.
The Wormhole (Poll na bPéist) is a unique natural rock formation on Inis Mór that connects to the Atlantic Ocean, creating an extraordinary dive site.
Yes. The Wormhole Fun Dive is for advanced certified divers only due to challenging conditions and site accessibility.
Depth varies with tides and conditions but generally ranges from 10–18 metres.
Expect a mix of kelp, rocky formations, and Atlantic marine life. The Wormhole is a unique site, offering dramatic underwater scenery and sometimes surprise visitors.
Access is from the boat.
No. The Wormhole is weather and tide dependent, so scheduling flexibility is required.
For scuba, we use 12L steel air tanks with single-valve DIN or Yoke.
No. We don't provide Nitrox.
No. We use wetsuits 7mm (extra shorty 5mm if needed) all year round.
Yes. You will finish at around 12 pm.
To book this adventure stay on this page and use the calendar.
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Discover the Atlantic with daily fun dives on the Aran Islands. Small groups, guide and unforgettable adventures.
Earn your Advanced certification and dive to 30m, unlocking the Wormhole and other world-class dive sites.
Learn to prevent and handle dive emergencies with Stress & Rescue, your last required step toward Divemaster.
