Going to altitude after diving may be a problem because at altitude atmospheric pressure drops in a similar way to when you fly. There are flying after diving guidelines to follow, which should also be followed when driving to altitude after diving. Depending on the organisation flying after diving guidelines you wish to follow. Plus depending on how many dives you’ve done and whether these involved decompression stops, the recommended surface interval can be anywhere between 12 hours to 24 hours before you drive to altitude after diving.
Whether you can you dive and fly on the same day boils down to the risk you are willing to take. It depends on which flying after diving guidelines you want to follow. Plus it depends on how many dives and the type of diving you’ve done. Your decision should also be based on decompression risk factors and how many of these affect you specifically. Certain organisations provide flying after diving guidelines that look at the maximum altitude you will be flying at and whether your dives involved decompression stops. DAN and PADI’s flying after diving guidelines begin with a surface interval of 12 hours to a maximum of 18 hours before you fly after diving. Whereas BSAC and the U.S. Air Force recommend a 24 hour pre-flight interval after surfacing from your last dive before flying.
Whilst the cause of scuba dry mouth is down to breathing dry compressed air through your mouth, it can be prevented. Examples of how to prevent a dry mouth when scuba diving includes: Keeping well hydrated by drinking plenty of water; avoid drinking excessive amounts of caffeine and alcohol; Being aware of the diuretic effect of any medication you’re taking; swilling some water in your mouth when diving; or diving with a full face dive mask so you can breath through your nose. instead of your mouth.