They are still running
other tests, including measuring the length of a fibre - optic cable that carries information from the
underground lab at Gran Sasso to a data - collection centre on the surface.
At Lawrence Livermore National Laboratory (LLNL) and
other DOE national
labs, these systems will play a vital role in the National Nuclear Security Administration's (NNSA) core mission of ensuring the nation's nuclear stockpile in the absence of
underground testing.