In depth under water fossil island Agility/Thieving guide
0.07-0.34 Getting there
0.35-0.44 Requirements
0.45-1.03 XP rates at low and high levels
1.04-1.32 Learning the map
1.33-6.19 Clam & Chest spawns
6.20-7.55 Spending Tears on XP
This method is much more afk than any other agility course. I highly recommend it compared to the boring grind of rooftop agility