The train from Chamonix-Mont-Blanc to Montenvers has been taking people to view the Mer de Glace for 112 years. Originally powered by steam, it was electrified in 1953. The excitement of the travellers is palpable.

More exciting even than a train journey is a helicopter rescue.

Les Bois is home to the Chamonix two mountain rescue teams and their Eurocopter EC145s. Dragon The Securite Civile helicopter is already at work and as we arrive. Choucas of the PGHM is being made ready. The helicopter disappears up towards Mer de glace but soon returns, its rotor wash blasting me as it lands.

Let's start with Montenvers.

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