Welcome from Virginia!
I did some checking and could only find references in Quezon City to tunnels. I couldn't find anything in Lucena to do with tunnels, but that was a limited search. But the city's orginal name was Cotta, which means strong fort. If a fort or forts were built, they could have had subterranian chambers. These type of chambers could have been grown over in time.
I also did a small amount of checking on multispectral databases. Multispectral and hyperspectral imaging can detect below ground (and water) structures. Tunnels can be detected using this technology -- especially tunnel entrances (even those not visible by eye). There are a number of such satellites over Earth now. It would take you a lot of time to find and then evaluate these images. Some providers require you to purchase the image. But it might be worth a shot to check these.
I am toying writing a post here on how to make a "poor-man's" GPR from off-the-shelf hardware. I'm a radar guy and I have built many radar systems. If I get some time, I'll do this.
Anyway, good luck on the searches and welcome aboard.
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