This is Chapter 5 of the Black Mesa Incident.
The Blast Pit... A test chamber for testing a rocket thruster. And like I said, we make some missiles for the Military, and now they are using it to destroy Black Mesa. It is useless. I am very bored and my head is full of depression and boredom I'm depress because of those poor friends that died and it is because of me. G-Man is still watching me. I don't know why and I'm confused that every time I close the only door leading to the other place, he would be there. But this time, he is not watching me. For some reason, or it is because the place is so small that he got too lazy? I don't know. Maybe?
And then, there's this thing that is much larger than me... It is a Tentacle. A dying scientist said his last words to me before he died.
"Freeman.. *moan* destroy... The thing before it grows any larger.."
And I almost got hang up by the tongue of the barnacle hanging. I went inside the control room and saw another scientist. I felt sleepy but the Tentacle suddenly burst in the control room, catching the scientist and dragging him to the Pit.
"WHAT IN THE NAME OF GOD!! We are being invaded by Godzilla!"
I'm shooting the Tentacle with my M4A1 but it won't die so I press the "Test Fire" button but it won't work because the fuel and the gas is not running and the power is turned off. I discovered that explosions can attract the Tentacle so I went outside, and throw some grenades while it is distracted... I made a run for it.