the samdzong remains only date to 400 ad.he earliest known pottery in the region dates back to 800 bc, so there must have been people earlier than samdzong. and mark wants to find them. today's archaeological objective is a cave at 10,000 feet known as rhi rhi. it's a few hours' journey from the nearest town. a complete kitchen, cook staff, climbing gear, tents, and food make up the loads which will have to be carried across a river called the kali ghandaki. this is the deepest river gorge in the world, carved by the glacial meltwaters of some of the world's highest mountains. any other time of the year, the river runs so high here it's impassable. with anchors firmly in place, pete can rappel down a slope most climbers would avoid altogether. pete leads another double rappel with mark. aldenderfer: hold on a sec. athans: okay, you can just keep lowering yourself in till you're seated at the edge. there you go. we're good. narrator: it doesn't take long for them to find what they're looking for. aldenderfer: these are all hum