The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Hawaii Island Subsidence GPS Network - KKAI-Kula Kai Caverns P.S.
Start: 20-May-2021
End: 14-Nov-2022
Freymueller, Jeffrey T., 2021, Hawaii Island Subsidence GPS Network - KKAI-Kula Kai Caverns P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/XZTT-YC04