The long term solution is to stop being naive about submarine cables. This is a well-known vulnerability, inevitable, and ignored. There are better alternatives now, and locally this may be temporarily re-routable. But there's no way to protect existing cables on par with something like the Hardened Intersite Cable System (HICS). I'm surprised it hasn't occurred more in the Persian Gulf area. And it could occur in western urban areas with relative ease. Most critical cabling intersect points in the US are unguarded, although may have cameras or other remote monitoring.