The difference between Tommy's and Theresa's locations is 522 feet below sea level.
To find the difference between Tommy's location (-2034 ft) and Theresa's location (-1512 ft), you can subtract Theresa's location from Tommy's:
Tommy's location - Theresa's location = -2034 ft - (-1512 ft)
Remember, subtracting a negative number is the same as adding its positive counterpart:
-2034 ft + 1512 ft = -522 ft
Therefore, the difference between Tommy's and Theresa's locations is 522 feet below sea level.