North of the Ardougne lever and the web in level 55 wilderness. You'll need to dig at the location shown in the map below while having the clue scroll and navigation tools in your inventory. Be ready to fight a lvl 65 wizard that will attack you with the flames of Zamorak spell, you'll need to use the protect from magic prayer. Avoid bringing items that you are not prepared to lose. If you are attacked by another player you can teleport away unless you're above level 20 wilderness, at higher levels you just log out before you are being attacked.

Required items: clue scroll, watch, sextant, chart, spade, weapon able to cut a web, two pieces of armour, anti poison, teleport runes and food.

Required quests: none.

Possible way of transport: Ardougne lever. You can access the Ardougne lever from the little house West of the Ardougne castle, it will teleport you to the Deserted keep.