Upside down floating reef in the bay - Kinda Interesting

https://www.buzzfeedzz.com/en-us/video/other/upside-down-floating-reef-in-the-sf-bay-could-change-ecology-of-shoreline/ZZ16CEhn

Why not just use an old boat or some other simple floating platform, rather than that hideously ugly thing? Also, the transcription is pretty hilarious...