Deal with Jellyfish then go with Jester's idea or something, then after I can do the thing with the heart when you guys get there.
As for light issue, the whole place is a dimension of water, the light just naturally generates instead of a source like a sun. (Yes this whole Rp will cause scientists headaches)
Romans 8:31 What, then, shall we say in response to this? If God is for us, who can be against us?
1 Corinthians 13:1-3 If I speak in the tongues of men or of angels, but do not have love, I am only a resounding gong or a clanging cymbal. If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love, I am nothing. If I give all I possess to the poor and give over my body to hardship that I may boast, but do not have love, I gain nothing.