Final answer:
The location of the scuba diver in the water is 45 feet below the surface.
Step-by-step explanation:
To find the location of the scuba diver in the water, we need to add the initial depth of 30 feet to the additional 15 feet he descended towards the surface. Adding these two depths together, we get:
30 feet + 15 feet = 45 feet
Therefore, the location of the scuba diver in the water is 45 feet below the surface.