Apparently Norwegian is dropping (some) requirements as of 8/1/22:
Norwegian "will drop its pre-cruise testing requirements on nearly all sailings from Europe and other locations outside of North America, effective Aug. 1, 2022." "Effective for sailings 8/1/22 and beyond for cruises originating in any port except a U.S. port, Canadian port or Piraeus, Greece: All guests are exempt from all pre-cruise COVID-19 testing requirements,” reads a portion of the Sail Safe section on NCL’s website.