"Riven, your task is pivotal. Outside the cave entrance, you need to use this sonar to scan the passageway leading downwards. I know that in such narrow rocky environments, signal interference will be severe, and we might not get a complete 3D map."
He paused, pointing at the sonar screen, emphasizing, "But you don't need to build a complete model. You have only two objectives."
"Firstly, determine the approximate material of the blockage through the intensity and decay speed of the echo — whether it's loosely dense, uneven natural falling rocks, or more even, uniformly dense man-made objects like a cement wall."
"Secondly, estimate the distance from the entrance to the blockage by using the maximum detection range."
"Meanwhile, I'll use this time to carry equipment, recheck, and secure the safety ropes leading to the upper fork, preparing for immediate entry."
