If IMC, descent to your minimum safe altitude, that's all you can do to be safe initially. 10,000 feet is not a magic number of consciousness; people live at and fly into airports at higher elevations, like La Paz, Bolivia, which is 13,330' MSL. . . . Besides, you and your passengers have oxygen for at least 20 minutes, which is a long time to get you south towards lower terrain.
If you go to Google satellite maps you can run your curser over the terrain and it will tell you the elevations, much better than aviation charts.
