On the drive from Geneva through Lausanne, Bern, and Basel to Colmar, France, then back via Biel/Bienne and Neuchatel, we must have passed through about 50 tunnels.
The Swiss love tunnels. There are 1,329 of them in the country, according to the Swiss Tunnel Database (https://www.swisstunnel.ch/en/tunnelling-switzerland/tunnel-database/). The longest, of course, at 57 km (35 miles), also the longest and deepest in the world, is the new Gothard Base Tunnel, a rail trail from Erstfield to Bodio. It took 17 years to build the 153,500 metres (503,608 feet) of tunnels, shafts and passages.
The tunnels we went through were long, short, curved, and sloped up and down. Kind of like the tunnels in life.
The problem when we enter a tunnel in life, a dark period, is that we don't know how long it will last, nor what we will find when we get to the end. If we get to the end.
At times on our trip, we would exit one tunnel only to immediately enter another. And sometimes another. At one point there were five in succession in less than 2 km.
The Swiss tunnels are generally well lit, so are not as intimidating as some of the dark, dank tunnels we've been in elsewhere. They are even well marked, showing the direction to the nearest (pedestrian) emergency exit.
Quite often, as we emerged from a tunnel, we were greeted with some spectacular oooh-ahhh scenery. (A lot of that in Switzerland.)
In my life, there have been multiple tunnels - job losses, for example. Times when I didn't know when the next job might come, what it might pay, even where it might require me to be. Not knowing in the meantime whether we could keep the house, the car, or even have something decent to eat. Through most of my life, I had confidence that the jobless tunnel would end, that I would surely find the next decent position, and it often turned out the new role was ultimately better than the one I'd left. But as I got older, recognizing the age discrimination of many companies, I became less sure of the future.
Others have gone, or are going through, longer and darker tunnels than have I - the prolonged illness and eventual loss of loved ones is perhaps the worst. I've done the prolonged illness part but thankfully not the loss. I can only imagine the pain that someone suffers; it must seem like tunnel after tunnel with rare glimpses of light.
The tunnel metaphor appears frequently in literature, music, film. Swiss author Friedrich Durrenmatt's short story "The Tunnel," depicts a student who boards his usual train to the university, except the small tunnel doesn't end ... 10 minutes, 15, 20. The other passengers are blissfully calm, but the conductor is evasive, and the student learns there is no engineer in the locomotive. The story ends with the word, "Nothing," a possible commentary on the ignorance of society in the face of imminent disaster. (It was written 65 years ago.)
Or perhaps you prefer to think of movie scenes in which a train enters a tunnel just as a couple burrow beneath the sheets. We are left to our own imagination what happens in the tunnel (at least in older films). Hitch's ending in "North By Northwest" is one of the better ones: https://www.youtube.com/watch?v=DPt-4Nwght0.
Tunnels are inevitable in life. Let's hope yours are mostly like the Noirvaux in Neuchatel (15 metres, or about 50 feet - built in 1843), and that the scenery on the other side lifts your spirits for the rest of your journey.