Did you already know such things existed in the game or was it a total surprise?

One of the scariest parts of this game for me was receiving the following message from the computer. You may not have heard this yet so proceed with caution

No that's not it, it is....

Scans indicate multiple leviathan class lifeforms in this region. Are you sure what you are doing is worth it?

Animals flee this hell, the hardest stones cannot bear it for long. Only men endure