The answer is that Kate went part way into the Tapas complex and shouted. Six of the seven people at the table ran to her, then they all ran to 5A. They did not look in the pool.
This part of the story has always fascinated me. Why did they a;ll run to 5a? why not to their pwn apartments to check their own children. 6 people checking a small apartment? AFTER being told by Kate she knew right away her daughter had been abducted. we here nothing of the details of those conversations which I assume took place.
Did Kate tell the tapas group? and when did she tell them MBM had been abducted because of the window-blowing curtains blah blah. Did she not tel them she knows she is missing because she checked the apartment if so, why did they all go to the apartment to 'look for her' if they knew she was abducted!
Friends and family back home told media that evening no one was looking for MBM AND the police were doing nothing They claimed the parents were out all on their own searching- which is a blatant lie.
So, as other people and the police had gathered to search the vicinity, which part did Kate and Gerry look that the searchers didn't look, and how did they know those places were not searched? bit of an anomaly.., In my opinion all made up like the jemmied shutters.