The outside of the building has 100% coverage.

整个大楼外围都是百分之百监控的
What about under the building?

那楼底下呢
Under it?

底下
A research facility dealing with sensitive materials

常和敏感材料打交道的研究机构
would need to have some sort of flood controls.

一定会有某种防洪设施
Can you pull up a map of the drainage system myriad?

能把排水系统的图纸调出来吗
- Drainage tunnels go right under the building. - We thought of that.

-排水管就在大楼底下 -我们曾想到过
We checked all the access points,

我们排查过所有接入点
including the drainage grids.

包括排水口
- They're all welded shut. - Check 'em again.

-它们都焊死了 -再查一遍
If they did use the tunnels,

如果他们真是从地下走的
they wouldn't have wanted to travel too far.

他们不会跑太远