Presumed Missing

Two climbers are missing, but since the searchers aren't sure the missing climbers are missing, they will only list them as "presumed" missing.

Apparently they haven't ruled out random invisibility.

Climbing team believed missing
Seasoned pair didn't return from China trip
By MIKE LEWISP-I REPORTER

The owner of the Seattle-based guide service Mountain Madness Inc. and another elite climber are presumed missing after they failed to return from an expedition to a remote mountainous region of southwestern China near Tibet.
...
"The fact that no one knows where they are is consistent with climbing without a permit," said Eric Simonson, owner of International Mountain Guides.