Afterwards approach the old location ofSanctuary(Sanctuary Hole).
Use the valve to reach the lower level.
Afterwards use the passage leading toCaustic Caverns.
Use the valve on the left side of the large gate to initiate the passage.
Killing five enemies of this kind will give you additional experience.
For critical hits, aim at the crystals on the enemies' limbs.
Another punch in of enemies that can earn you additional experience areThreshers.
In this case their weak points are the bright spots marked on the above screenshot.
The last enemy throw in worth killing for the sake of bonus experience areSpiderants.
Critical damage can be dealt by shooting their abdomens.
After eliminating enough enemies to receive the additional experience, collect the otherEcho Recorders.
Return toSanctuaryand speak withHammerlock[1] to finish the mission.
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