To find the water level at the end of summer, you need to add the two depths below sea level together.
The initial water level is 112 meters below sea level, and during summer, it drops an additional 213 meters below sea level.
So, you calculate:
112 meters + 213 meters = 325 meters
Therefore, at the end of summer, the water level is 325 meters below sea level.
The water level is 325 meters below sea level.