To exit with out forcing yourself to respawn: • Accept SubLevel 13 Part 2's mission. • There's a ladder that's above the dead guy • Jump to it to climb out • Follow the tunnel to a small cave then jump to a room. • Listen to the ECHO. • A wall panel will blow off, follow that. Note: It won't blow off until you've accepted Part 2 of the mission.

You should be able to figure the rest out from there.

To exit with out forcing yourself to respawn:

• Accept SubLevel 13 Part 2's mission.
• There's a ladder that's above the dead guy
• Jump to it to climb out
• Follow the tunnel to a small cave then jump to a room.
• Listen to the ECHO.
• A wall panel will blow off, follow that. Note: It won't blow off until you've accepted Part 2 of the mission.

You should be able to figure the rest out from there.