• Snorkel Instructor


  • Seal Picture



  • Waves



  • Sea Swimmer


Welcome to Tonic of the Sea

Cornwall BSAC snorkel instructor, sea swimming, marine life photography, marine mammal medic rescues with the British Diver Marine Life Rescue (BDMLR) and conservation work with the Mounts Bay Marine Group.

NEW - Snorkelling Experience!

Join me, a BSAC qualified Snorkel Instructor at low tide for a memorable Cornish snorkelling experience.

What people are saying!

Thank you SO much! We had the most brilliant experience with Katie today! I decided to take my best friend on this snorkelling adventure as her birthday gift and I couldn't have thought of a better way for us to celebrate. Katie is somewhat of a legend to us having followed her for a while on instagram seeing all her incredible sea adventures. We are so happy to say she lived up to our expectations and more! Katie was so kind and encouraging and explained some useful details about snorkels to us as my friend had never snorkelled before and so this was very comforting to be able to have that intro before starting. Katie's energy and enthusiasm was infectious which just revved us up even more - you can tell she's the kind of person who just wants to share the sea's joys with as many people as possible and is a true local, with everyone coming up to her for a chat. When we got in the water we were truly awed by how colourful it was under there and so close to the shore! It's the perfect way to intro someone to snorkelling because the swell wasn't big, we were in very shallow water, the sea was clear and we were near to dry land. With her expertise Katie spotted small cushion starfish and pointed out different types of seaweed as well as sponges and other sea magic. We left the session with the biggest smiles on our faces and even more in awe of Katie and all that she does! Legend!!
Thank you Katie for helping us explore the magical sea gardens of Mount’s Bay. The colours! The fish! The way you become so absorbed in the pinky-green gorgeousness it’s impossible to think about anything else. We all felt very safe and now have no fear of what may lurk beneath! It was such a treat to be accompanied by Katie: her enthusiasm, knowledge and sheer delight in the sea are infectious. Highly recommended!
Many thanks again for such a wonderful introduction to the joys of snorkelling. Both Ian and I were so impressed not only by your professionalism and the detailed information you gave us about safety etc but also the sheer beauty of what we saw so close to the beach - together with the exciting encounter with a spider crab! We have continued chatting today about the variety of shapes, sizes and colours of the seaweed. You introduced us to a magical world we only thought possible in the Tropics! A big, big thank you Katie.
Thank you so much Katie for taking us snorkelling along the Cornish coastline. We had an absolutely awesome time and can't wait to come back to explore some more!! Thank you for showing us the ropes and for taking us to some incredible locations. Look forward to seeing you again soon :)
Two snorkels with Katie this weekend, ticked an item off the bucket list. The time in and out of the water with Katie was way more than what snorkelling normally is. To be in British waters, being shown local underwater habitats that are there ready for exploring would never ever have happened for me had I not been so inspired by her story several years ago. Feeling an affinity with Katie's reasons for finding the sea and it's true healing properties made these trips all the more special for me. A wonderful experience, highly recommended, thankyou!
The snorkel safari was brilliant a great experience for the whole family. We had no idea there was so much to discover in the water around mount’s bay… so many sea creatures and beautiful colours you felt like you were discovering a secret world. Katie is a fantastic guide she is so knowledgeable and enthusiastic we learnt so much from her. We cannot wait to book again Thanks katie
Wonderful. My boys and I had a brilliant hour snorkelling with Katie. Her knowledge of the area, the conditions and the sea life we would see was superb made the session something none of us will forget. Thank you Katie.
Had the most amazing experience snorkelling with Katie. She is so knowledgeable on the beautiful plants and animals and her enthusiasm is catching. This is a must do as it was like being in an underwater fantasy garden, the colours of the plants and sea life was spectacular. Thanks Katie you are brilliant.
Absolutely lovely, magical Snorkel, the seaweed is like swimming through a fantasy world. Katie found us spider crabs, beautiful jellies and lots of wrass. So good to be snorkelling after nearly 4 years of not diving.
Katie provided a warm welcome and clear explanation of what the introductory session would entail and what a safe environment it was for a ‘taster session’. The experience was magical, seeing the many different types and colours of kelp, spider crabs, starfish, sand eels and various other fish. A truly memorable experience.
  • Follow Me @tonicofthesea

    Follow my journey of sea swimming and snorkelling whilst learning about the wonders of our Cornish marine life through my underwater photography, my work as a Marine Mammal Medic for the British Divers Marine Life Rescue and conservation role with the Mounts Bay Marine Group.

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