What action should be taken first after clearing your regulator?

The first action to take after clearing your regulator is to exhale deeply. This step is crucial because taking a deep exhalation not only helps to ensure that the regulator is functioning correctly and that there is no water trapped inside, but it also stabilizes your buoyancy. By exhaling deeply, you reduce the volume of air in your lungs, making it easier to maintain control of your ascent or descent.

Exhaling also allows you to assess your breathing and confirm that you are getting a steady flow of air. This is an essential safety procedure, as it ensures that you can effectively use your breathing apparatus before proceeding with further activities like swimming to the surface or adjusting your mask. Inhaling sharply immediately after clearing might cause you to inadvertently take in water if the regulator isn't completely cleared. Similarly, moving to the surface or adjusting your mask without ensuring a clear and functional regulator could lead to safety risks.

Overall, exhaling deeply gives you the opportunity to ensure your equipment is working optimally and confirms that you can breathe easily before you proceed with any further actions.