TEQUESTA, Fla. (AP) — Families hope for a miracle as rescue crews head into a seventh day of searches Thursday for two teens missing at sea.

The Coast Guard, which is leading the effort involving several agencies, have insisted it remains an "active and open" case now focused on a mammoth swath of ocean stretching from Florida up to the coast of South Carolina.

Chief Petty Officer Ryan Doss called the decision on how long to continue looking for the 14-year-old fishermen, Perry Cohen and Austin Stephanos, a mix of "art and science." He says that juggles knowledge of how long people can survive adrift with unknowns on whether the boys had flotation devices and drinking water — and even the extent of their physical stamina.

(Story by: Matt Sedensky, The Associated Press)