Below are transcriptions from two of those calls.
Dispatcher 1: Palo pinto County, what's your emergency?
Caller 1: we're at the lake, and we just jumped off a cliff and one of our friends is under water. One of our friends is under water.
Dispatcher 2: Do you know this person's name?
Caller 2: I don't, I don't. There's a boat of young boys out here and he jumped off the cliff and he didn't come up. There's nothing we can do.
Additional divers from the Parks and Wildlife Department have joined the search for Jacob Logan.
Also, more sonar equipment has been brought to assist.
Logan was cliff diving with friends on Sunday afternoon, when he jumped from a height of about 25-30 feet into the water.
Authorities said he surfaced briefly, before going back underwater.
Authorities said he was not wearing a life vest.