An introductory caving session at Herts Young Mariners Base in Cheshunt. Their artificial caving system is quite safe but great fun to explore!&#8200;Wear clothing with long sleeves and trousers. Passages are either big or small - you don’t have to go through any really little holes if you don’t want to (although there are some if you want a challenge). Meet and collect at the venue (Windmill Lane,&#8200;Cheshunt EN8)