What was the cause of the tragedy?

M: Did you hear about the air crash that occurred in South America recently? It was quite a tragic accident!
W: No, I didn’t see anything in the news about it. What happened?
M: A foreign airliner was attempting to land at night in a mountainous area in Argentina and flew into a hill!
W: That sounds really terrible! Did anyone survive?
M: No, everyone aboard, including the crew, was killed instantly.
W: What were the circumstances? Were they bad weather, a fire, or engine failure?
M: Apparently, there were some low clouds in the area, but mostly it was just miscommunication between the pilots and the air traffic controllers.
W: Weren’t they both speaking in English, the official international aviation language?
M: Yes they were, but the transition from poor quality radios was slightly distorted and the accents of the Spanish speaking controllers was so strong that the pilots misunderstood a vital instruction.
W: How could a misunderstanding like that cause such a serious accident?
M: The pilots were told to descend to 22, 000 feet. The instruction actually meant 22, 000 feet, but they thought they heard descend 2, 000 feet. That’ s a huge difference, and it should have been confirmed, but it was not. Unfortunately, the terrain of the mountains in Norweija ascend to 2 , 000 feet.
W: So the pilots did descend to the wrong altitude then, because they were following the air controller’ s instructions.
M: Sadly enough, yes they did. It was a really bad mistake. Many people died as a result of the simply misunderstanding.
W: Wow, that’ s a powerful lesson on how important it can be to accurately communicate with each other.