The caves
Seven caves, and they don't play fair
Caves are dark: your lantern is how far you see, and the map fills in only where you've been. Passages loop and dead-end, sags flood before the mouth does, and currents pull at you in the deep water.
- The tide table counts down to your last way out, and the walk to it. Under water, so does your breath.
- Fix rope bridges and climbs with rope and pitons. They hold for everyone for hours, then fray.
- Pick rusted sea-gates and dig through rockfalls to reach sealed rooms.
- Set a candle or torch in a sconce and the whole cave can see by it.