Rule 1: You must wear a full-body wetsuit that's 99% black, 1% neon pink, and has built-in oxygen tanks. Duh.
Rule 2: No scuba gear allowed. You're not just swimming for fun, you're here to play hockey.
Rule 4: You must score 5 goals in 5 minutes to get extra points. If you don't, the octopuses will laugh at you.
Rule 5: No underwater referee allowed. The sea lions will do it.
Rule 7: You must drink at least 2 liters of saltwater to prove your dedication.
Rule 8: No underwater referee allowed. The dolphins will do it.