The spirit of the Celtic deep.

No way of knowing what you’ll encounter, yet knowing anything is possible.

That is the spirit we keep at the heart of every expedition.





Our first trip was something that will forever stick with us. The anticipation as we threw off the bow lines. We were leaving a sheltered harbour, heading West to explore the Celtic Deep. To us a marine wilderness was within our reach. No way of knowing what we'd encounter, yet knowing that anything was possible. That's the spirit we want to keep at the heart of every expedition. So far so good. 

Our trips look to explore the islands and offshore habitats in the stretch of water between Wales and Ireland. It is home for some of the UK's largest and most iconic marine megafauna. Sharks, whales, super pods of dolphins, even giant bluefin tuna. It's all out there. To enter the clear water of the open ocean and observe blue sharks 30 miles from the Welsh coast is an exhilirating experience. 

We're passionate about sharing the wonders of our marine world and getting wet doing it. Celtic Deep is run by conservationists. Our aim is to collect information and pass on what we learn about the spectacular wildlife that pass through our waters so that decision makers can put right measures in place to protect it.