SOLVED. YA SciFi. Group of teens on a field trip to a nano tech facility where they are then attacked by the facility (robots, sections caving in, having to hide underground, etc.). Spoilers ahead. [s]

[Kenzie]

There is an underground section to her mansion (family owns and runs the bio company) and it ends up with her and the boy actually were part of their experiments. The mfc and mmc do end up falling in love I think?

[Becca]

Infinity Lost by S. Harrison?

[Kenzie]

yes! thank you!

[Kris]

Glad you found your book, Kenzie. I removed some spoilers from the header/ topic title, and added a spoiler alert and the genre.

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"Mfc saves them with some fatalities along the way."
(hide spoiler)]