The California-Hawaii S1 (CHI) cable system spans 3,932 kilometers, connecting Mahaka, Hawaii and Morro Bay, Califonia.

The CHI cable system is in fact the Segment 1 of the Japan-US CN, which was decommissioned in July 2023, with its Segment 1 remaining operational.

The CHI cable system is jointly owned and operated by Verizon Business Global and Hawaiian Telecom, which jointly filed with the FCC to operate the CHI cable system in July 2024. 

The CHI cable system consists of 4 fiber pairs, with a system capacity of 14.4 Tbps.