I think that it is we who are in the submarine.
Check out this meme I found.
Could Flat Earth with a Dome over our head be real?
The Bible does say, "let there be a firmament ind the midst of the waters
to seperate the waters from the waters."
could this song be talking about 'the waters above the firmament?"
Check out the lyrics for YELLOW SUBMARINE
In the town where I was born
Lived a man who sailed to sea
And he told us of his life
In the land of submarines
So we sailed up to the sun
Till we found the sea of green
And we lived beneath the waves
In our yellow submarine
We all live in a yellow submarine
Yellow submarine, yellow submarine
We all live in a yellow submarine
Yellow submarine, yellow submarine
And our friends are all on board
Many more of them live next door
And the band begins to play