After entering the gate code the water rushes out into the room, the tentacle punches through the wall and waves menacingly and the room fills with water. At this point I can see only bubbles and bubbles and bubbles. According to a Walkthrough on YouTube, I'm supposed to eventually see an aquatic floor and a page. All I see are bubbles. I tried all the movement keys, spacebar, and enter keys without any change. Anyone have any ideas what might be wrong?

I am running this on Win 10.0.14393, x64-based PC, Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz, 2401 MHZ, 2 Cores, 4 Logical Processors with DirectX 12, 8GB RAM. Am I missing something?