A submarine is at a depth of $$-100$$ meters below sea level...

Question Analysis
This question tests the application of integer operations in a real-world context, specifically the change in depth of a submarine.

Key Concept Explanation
-a + (-b) = -(a + b)
To find the new depth, we need to add the additional descent to the current depth.
The new depth is given by .

Step-by-step Solution
1. Identify the current depth and additional descent: Current depth = meters, Additional descent =