Go to the basement through the center of the third level. First, however, obtain Dynamite from the container on the third level. You will need Dynamite to get to the center of the third level. A Damage Zone is located in the first basement level. Go carefully when walking through there.
Powerful enemies await.
You should carry Monomate and Dimate to recover your strength. Leave the Biosystems Lab immediately after getting the Recorder. The Commander orders you to go to the Library when you arrive at the Central Tower. When you arrive at the Library, someone there tells you the cause of the abnormality at the Biosystems Lab. She will give you a Key Tube to help you cross the Zema Bridge.