Dowser

You are the vanguard. You are the trailblazer. You are the cheapest and fastest way to get a rough idea of where water might be on that barren but probably totally fine unexplored planet down there. Take this stick and hold it like so, and when it points toward the ground, shove one of these stakes where its pointing and well drop a well as close as we can. If the well detects something, itll signal us, and well throw down some habitat pods. Apologies in advance for any bad trajectories. Were al...