Day 2, Disentis to Chur

I learned a salutary lesson today, happily at minimal cost, but more about that later.
We left Disentis with patchy mist shrouding the hillsides and settled in for a 31 km descent to Ilanz. It was not such a relaxing ride as we kept to the main road due to the recent bad weather potentially affecting the off-road option and it was moderately busy. The scenery was stunning but we concentrated on the road and with great relief stopped for coffee in Ilanz. The gloomy clouds disappeared and the sun came out as we delayered and commenced a long climbing section on a beautiful back road out of the town. Eventually we reached the high point for some respite as the sun was hot and bright. So here comes the lesson : as the road tilted downwards we came to a tunnel. We put on just the flashing lights as it was only 150m long, but it incorporated a tight RH bend and was unlit. Transitioning from bright sunlight to total blackness, wearing dark glasses, I had no exit to fixate on, no frame of reference to judge my position or orientation, and I started to wobble. The weight of the bar bag, combined with the weight of the panniers amplified the wobble and whilst I may not have known which way was up, I soon discovered which way was down! Spread-eagled in the dark with cars approaching was no fun. Anne was waiting at the exit having had a similar scare but not following through like me, and we stopped for a drink until I stopped shaking! As I waited I heard a group of motorcyclists screaming towards the tunnel followed by extreme rapid deceleration and a slow passage to my position. Two emerged, slowed, looked at each other and turned round and rode back into the tunnel. I strongly suspect a companion may have suffered a similar scare to me. My only consequence is a bruised hip and scuffed elbow; no damage to bike or clothing. Next time slow down and allow time to adjust to the dark!
We reached the confluence of the Vorderhein and the Hinterrhein (now becoming the Rhein), a raging torrent of battleship grey, silt-laden water, and stopped for a picnic lunch. A steep climb followed (dropped the chain twice - really must check that limit screw!) with the threat of a thunderstorm that didn't materialise. The gentle descent into Chur finished with a beer in the sunshine in the old town. Thence to the hotel for a shower and a pizza.
69.5 km; 17.8 kph avg; 3:54 moving time; 537m ascent!