Little Trolvis is a flooded granite quarry near Penryn with stepped shelves and a compact basin that keeps the route easy to follow. The dive is built around a trail of submerged attractions, including a blacksmith’s forge, an old wheel and cart, a motorbike, and sections of pipework, so each circuit gives divers a new landmark to work past. It is the kind of sheltered inland site that works well for beginners, skills practice, and relaxed exploration rather than for current or surge management.