These floors sink into the ground to become swimming pools

AGOR Engineering designs hidden pools. They're made with stainless steel contraptions that are waterproof and run on hydrolic systems that don't use oil. That way, they're safe. And also: expensive. One of these units is going to cost about $200 and $350 per square foot, although the company promises easy maintenance. Story by Jacob Shamsian and editing by Carl Mueller. Follow INSIDER on Facebook Follow INSIDER on YouTube