Chapter 440 'Who Dares?' (A massive 6,800-word chapter, seeking monthly votes)

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It was already a reality at the end of the last century.

In most cities, the management of sewage and wastewater treatment systems had been fully automated.

Even the less developed eighteenth-tier small cities had basically achieved a semi-automated process.

That is to say, in sewage treatment plants, there were only sewage pipelines and a large number of filtration systems.

There were virtually no people.

The security guards at the entrance could be considered as one of the few employees.

When Yi Lin and Oda Mai approached, the iron gate of the sewage treatment plant was securely locked.

The professional security guard was still snoring soundly, fast asleep.

Narrowing his eyes, Yi Lin took a glance from a distance and said with a touch of regret, "It seems we can almost rule out the possibility that this is Hirudo people's lair."

Indeed, it was somewhat disappointing.

Oda Mai slowly formed a question mark with her hand.