What event type had BODY CMAS in 1980 and underwater hockey?
CREATE TABLE "world_championships_and_world_cups" (
  "sport" text,
  "body" text,
  "year" text,
  "event_type" text,
  "location" text,
  "nations" text
);
SELECT "event_type" FROM "world_championships_and_world_cups" WHERE "body"='cmas' AND "year"='1980' AND "sport"='underwater hockey';