Re: @Chris G - It's OK
Not necessarily so simple. So system's probably going to be a 'festoon' style cable with links going in & out of landing stations along the route. That can simplify things like feeding power & maintenance compared to wet bits that may need an ice breaker before you can try yoinking up the cable to fix it. Or if it's being sold as a low-latency system, may have wet branching units spurring off to landing stations and some 'express' fibres for Europe-Asia traffic.
So not always as easy as tapping the end points, unless you're curious what hentai's popular with bored Russians accessing pron in Japan. The more interesting stuff in theory should be provisioned between landing stations, ie Russian Arctic bases along the coastline, so being able to tap that without TPTB noticing. Or if you're Russia, endpoints in Russia would need to comply with Russian telecommunications licences, which have some pretty stringent conditions. Especially given current geopolitical pressures, sanctions etc etc.