What’s the most nerve wracking thing about sending instruments into space?

Question: What’s the most nerve wracking thing about sending instruments into space?
- Keywords:
  emotion,
  launch
Asked by Josie.S to Craig on 3 Mar 2020.
- Craig Leff answered on 3 Mar 2020:
  
  The worst thing is the waiting — waiting on the launch, waiting during the cruise to Mars (though we do get to talk to PanCam during Cruise to make sure it’s OK), then waiting for landing. WHEN we finally make it through all that, then we can relax and enjoy ourselves pointed the camera and taking pictures.

Question: What’s the most nerve wracking thing about sending instruments into space?