Long Island swimmer rescued after 5 hours treading water, signaling with makeshift flag

Dan Ho was swept out to sea while swimming off Long Island's Cedar Beach.
He treaded water without a flotation device for approximately 5 hours before creating a makeshift flag to signal for help.
Two men on a fishing boat spotted Ho waving his shirt on a broken fishing pole and pulled him aboard.
Ho was treated for hypothermia and exhaustion before being transported to the hospital.
Authorities warn about the dangers of rip currents after a spate of ocean swimming incidents.