One of my first maps. Here I'm posting all the secrets of this map. There aren't too many secrets on it.
The best-known and most popular stash. It holds a couple of medkits, HEV batteries and satchels.
A stash that's best reached with a gauss jump. It holds HEV batteries and a long jump module.
Opposite the long jump stash there are pipes with snarks lying on them. Climbing up onto those pipes is no trouble at all.
There's a door in the stash with the long jump. I'll say right away that it doesn't open.
Some people don't get how to pick up the gauss. It's really easy: just walk up, aim at the platform (the Gauss gun is lying on it) and press "E".
When the glass comes down, the door closes and the player is walled in. If he has no armor, he'll be killed. The armor is in the next room, so it's better to drop by there first.
A little trick. If you climb onto the gauss platform and stay on it until the glass rises, you'll stay inside; enemies shooting at you will hit the glass, while if you shoot with the gauss, you'll shoot through the glass and hit your enemies.
And now the biggest secret. How do you get the Egon on entrance?. Many have watched some players climb into the opening and grab the Egon unharmed. But normally, if you climb into that opening, you get smeared all over the walls right away. So what's the secret?
The secret is that you need to activate a button first. The button is at a corner in the tunnel. All you have to do is walk up, press "E" and quickly run for the Egon before somebody else takes it. Once the button is activated, the player has 30 seconds; after that, the mechanism that smears players all over the walls is activated again.
Well, that's all. Read about the secrets of other maps in the "Half-Life Map Secrets" section