Heaving, pulling and pushing with all your strength, you grimace and pant as you realise just how embedded the coin is beneath the rock. The rock seems to mock you with its immovability, the coin shimmering just out of reach. You’ll be damned if you can’t get it free.

With a mighty tug, you finally feel the rock begin to give way beneath your fingers. Cracks begin to weave through the stone as, with one final crack, a part of the rock and the coin is wrenched free. Treasure in hand, you lift your head as the sound of something, or someone, splashing through water reaches your ears.

The noise is getting closer, and you begin scrambling to your feet.