New video shows the damage done after a sinkhole opened up behind two homes in Dunedin, Fla. - a city just outside of Tampa - swallowing up parts of both buildings, a pool, and a boat.

The family who resides in one of the homes told authorities they were woken up at 5 o'clock this morning by shaking, adding that it sounded like someone was banging a sledgehammer against their walls.

Authorities say they're worried about the hole and more potential damage, as it's already 35 feet wide ... and growing.