Table:
text: Underwater sports
World championships and world cups
World championships and world cups
Sport Body Year_ Event_type Location_ Nations
Aquathlon CMAS 2009 World Cup Not known Not known
Finswimming CMAS 1976 World Championship Hanover , Germany Not known
Free-diving AIDA 1996 World Championship Nice , France [ citation needed ] Not known
Spearfishing CMAS 1957 World Championship Mali Losinj , Yugoslavia Not known
Sport Diving CMAS Before 2011[ citation needed ] World Cup Not known Not known
Underwater football MUC not known not known not known not known
Underwater hockey CMAS 1980 World Championship Vancouver , Canada 5
Underwater Ice Hockey Not known 2007 World Cup Weissensee , Austria 8

Question: Which nations participated in underwater sports in 2007?