This place was discovered by Qiu Qianhai a couple of days ago. He found that the Cold Iron Sand in this area of the water was much more abundant than in other places.
When encountering such a situation, any miner with a bit of experience can guess that there's definitely a Cold Cave nearby.
It's a Death Cave!
As for how to tell it's a Death Cave... because you would feel the chill from a living Cold Cave from a distance of a mile.
To find a Death Cave, you first need to discover a place where the Cold Iron Sand is richer than elsewhere. For ordinary miners, only the veteran ones might perceive such slight anomalies.
But in front of Qiu Qianhai, who possesses a mysterious finger bone, these aren't issues at all.
Even a few days ago, he was always talking to Ji Yuan, saying that finding a Death Cave was as easy as pocketing something for him.
Now, he's actually found a clue... In other places, he can dig up no more than three and a half jin of Cold Iron Sand at most.
