To convert feet to miles, you can use the conversion factor that 1 mile is equal to 5,280 feet.
To find the number of miles in 31,960 feet, you can use the following calculation:
\[ \text{miles} = \frac{31,960 \text{ feet}}{5,280 \text{ feet/mile}} \approx 6.05 \text{ miles} \]
Therefore, the deepest part of the ocean is approximately 6.05 miles.