To find and open the safe in the “Ground Control” mission of Call of Duty: Black Ops 6, follow these detailed steps:

1. Enter the Airport Terminal:
– After the helicopter drops you off at the airport terminal, head towards the entrance.
– Take out the mortars and snipers on the roof first. Be sure to keep changing your position to avoid damage from incoming mortars.

2. Move Towards Departures:
– Once inside the terminal, move forward as you and your team take down the enemies.
– Keep moving towards the ‘departures’ door, which can be easily recognized by the many check-in counters and the crashed helicopter.

3. Find the Radio:
– Turn left towards the ‘departures’ screens.
– Get behind the long counter on the right side (if you’re facing the departure signs). The radio will be at the very end of this counter.

4. Tune the Radio Frequency:
– Interact with the radio to begin the waveform puzzle.
– Adjust the frequency and amplitude of the waveform to match the signal.

5. Get the Safe Code:
– Once you’ve tuned the radio frequency, you’ll receive a random code. This code will be a series of numbers that the radio will play.

6. Locate Office 1:
– After getting the safe code, look for the nearby Office 1 door. It is just beyond the vending machines.

7. Enter Office 1 and Find the Safe:
– Enter Office 1 and take an immediate left.
– The safe will be on the wall in this room.

8. Open the Safe:
– Punch in the safe code you received from the radio to open the safe.
– You will receive a reward of $1000.

By following these steps, you should be able to find and open the safe in the “Ground Control” mission of Call of Duty: Black Ops 6.