[I composed this over a month ago, but just found it in my Drafts. Apologies if I sent it before]
One of our cable cutting friends has been watching shows on Britbox and CBC Gem. One they suggested on CBC Gem was _The_Tunnel_. We just binged the ten 46-minute episodes in a couple days.
It's a UK/France coproduction from 2013. The only reason you know is old is because of BlackBerry phone and T9 style SMS.
It's a great murder mystery cop intrigue kind of show. Starting premise is that there is a dead body found in the channel tunnel at the border, so it's a dual investigation.
I also spent a fair bit reading about the tunnel and exploring Google maps for the areas. Adam has a beautiful country, when not foggy 😀. France looks good too 😀.