I like the way the filtered basslead goes up and down. :)
This is a huge underwater level with rapids a.s.o., where the little U-boat "A-Nautica" have to stand under high pressure of the ocean.
i've created this tune with DMC7 and recorded with my C64 (IC 8580 SID in it):
Please hear this sid under original devices ;)
Have fun to listen it.