1、an undersea cable [tunnel]

2、But, investments in undersea cable links are not without risk.

3、The number is higher in west Africa, where the more robust SAT-3 undersea cable provides for higher speeds and lower costs.

4、The risk of international communication failures caused by earthquakes and Mother Nature is mitigated, first and foremost, by your telco's participation in more than one undersea cable syndicate.

5、The biggest priority is laying undersea cables between the outer islands and Oahu.

6、The electricity is then fed into an offshore grid via undersea cables.