Depth progression works best when oxygen margin and navigation improve together.
Create breathing margin
More oxygen or better mobility gives you time to observe and make decisions instead of rushing.
Keep the route understandable
Markers and landmarks make deeper exploration safer and easier to repeat.
Check support systems
Power, repairs and storage can become the new bottleneck even after depth capability improves.
Use first trips for reconnaissance
Learn routes and hazards before turning deeper areas into resource destinations.