Drive to the 2nd base after the tunnel in Chapter 1.
This is the base where the houses and the station are on stilts.

Go to the exit of the base in the direction you came from.
Start here in the direction of the mountain.

It is best to leave shortly after the storm has stopped.
You should easily have enough time to cover the distance to the laboratory in two attempts.
You can also go straight to a sheltered room in the laboratory. If the storm does arrive shortly beforehand.
Please take something to eat and a first-aid kit with you in case you do fall down.

You can then take your time in the lab and go back down the mountain after the next storm. Be careful when jumping, not every ledge will make you stop and you will slide further down.
In the lab itself there is a little to collect, as usual in Heat Death some huge rooms with little loot in them. There is also a locked room.

The code for this can be found at the bottom of the large room where the plants are in glass domes.
There is a plant dome here where the light flickers.
Please observe this flickering carefully. Well...? It's Morse code.

Don't spoil the fun and try to find out for yourselves.
For all those who don't know Morse code and are lost in a 1km x 1km forest without their cell phone and don't feel like learning something new, they can download a Morse app on their cell phone and have the following light signals translated 😉.

…-- / -…. / .---- / -….

Translated with DeepL.com (free version)