Dive Man MI has some cool music. I just finished watching a perfect run of it, too. It has some crazy stuff which I never saw in an 8-bit Megaman game, which is pretty cool. I recently talked to HD on the servers and told him I can't map right now because I have my CTF maps to work on. Still, CTF isn't played at all lately what with the new CSCM and CSCC. And with the MM8 expansion coming soon, I think that's just another nail in the coffin for the mode.
So uhh, yeah. I'm interested in making Dive Man MI. Just so you know though, I have in mind making it a map like Ice Man, where it's separated into two areas. This is because I felt the underwater section has some relevant stuff to use separately, and I believe it can make for an interesting layout.