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Albert and Janette Aguero suddenly awoke early Thursday to what they said sounded like a "really loud clap of thunder." Then their bedroom began to shake.

Albert and Janette Aguero suddenly awoke early Thursday to what they said sounded like a "really loud clap of thunder." Then their bedroom began to shake. The New Jersey couple were vacationing with their two children in southern Florida, staying on the 11th floor of the oceanfront Champlain Towers South condominium in a unit owned by their parents. "The chandeliers and the pendant lights [were] just swaying completely, and that was not normal. It was not a clap of thunder and it wasn't a storm; it was something else," Albert Aguero told ABC News' T.J. Holmes in an interview Friday on "Good Morning America." "The whole bedroom was shaking so violently that, honestly, I was prepared for the whole building to come down," Janette Aguero added.