Underwater Demon Bases since the 1700s? (Don't answer too quickly)

There has been a lot in the news recently about the military finding 5 underwater locations that they primarily see UAP emerge from. In the 1700s Roger Morneau said that spiritualism went into hiding. Does spiritual entities need to hide, do they exist in a different realm? Or, are they much more physical than we realize and would need a place to "hide"? Lets dig into the Bible and see what it says. All that on this episode.