Amazon held their "re:Invent" event two weeks ago. Wasn't there, but I'm a James Hamilton fan so I started watching the recordings of his talks. In one, he talks about fiber optic cables under the oceans. Here's the start of that section: https://youtu.be/AyOAjFNPAbA?t=672 Even though this is presented at a suitable level for a large event (32'000 attendees total, holy cow) of mostly non-network specialists, I learned a few interesting things, e.g. about dealing with shunt faults. If you rewind to a few minutes before that section, he also talks about Amazon's private inter-DC network and how it is all (N*) 100G now. -- Simon.