I was just going by what they said in the actual podcast but that definitely sounds right. https://www.retrowdw.com/podcast/podcast-episode-26-tiny-bubbles-20k-leagues-under-the-sea/Reading more about the refurb, it seems it took place September 1975 through Spring of 1976. I believe you misheard air actuators as "water activated". They were pneumatic rather than hydraulic.