A-2-Sea has longstanding relationships with a broad range of customers within the telecommunication industry, and these include:
- Alcatel-Lucent
- BT
- CNS
- Level 3
- Apollo/ASN
- Jersey Telecom
- Guernsey Electric
- Cable & Wireless
- C&W Guernsey-CI & IOM
- Lime
- Tyco
- Level 3
- QinetiQ
- International Telecom
- GlobeNet
- US Navy
- BP
- Hibernia
- Main One
- Global Marine Submarine Systems
- Manx Electricity Authority
- TE SubCom
- Nexans
- Global Crossing
- Xtera
- Reliance
- Teledyne
- OMM Operations Marine Management
- Falmouth Divers
- Global Cloud Exchange
- HBJ Gateley
- Engineering Technology Associates Inc
