"It's such a big area down here and there' so many nooks and crannies, and for 15 animals to go into a little bay somewhere it's always a high possibility."
Halliday said the people who reported the whales said they had seen several calves and juveniles so she presumed it was a nursery pod.
"Being a nursery side of the pod I'm actually wondering, and we'll never know, if maybe some body may have had a pregnancy or birthing issue going on, that's a possibility and sometimes they'll come into a shallow area if there's something going on. But there may be something else happening out there and they've come in for a short time."
Project Jonah were also aware and had local medics on standby.
Halliday said she hoped the pod had made their way out to sea again.
In September four adult pilot whales, part of a pod of 30, beached 2km south of Ruakākā Surf Lifesaving Club.
• Punters in the area are asked to keep their eyes peeled and call 0800 7283 94253 (0800 SAVE WHALE); or Department of Conservation on 0800 362468; or Project Jonah 0800 494253.