On the final day of filming Jem and the Holograms, the action moved to a large water tank located at Tank One Studios in Signal Hills CA near Long Beach.
Jon Chu posted the following photo on Instagram:
This looks very similar to a photo on Tank One's website:
This followed three day of nightshoots on the Santa Monica Pier. While we hope that they were filming a live action reenactment of the Come On In (The Water's Fine) video, chances are the two shoots were related. We know Zipper was at the pier location due to Nathan Moore's incredible sunset photo he posted on Instagram. The pier location has to be more than just a quick scene with so many days spent there, so it could be an action scene with Zipper doing something and someone ending up in the water sounds likely.