Arrive on your own by morning /night train to Kandalaksha with a transfer to the bus to Umba (the option of arrival via Murmansk or Apatity is not cheaper and does not give time gain, the train is more convenient, only if you did not want to visit Murmansk, I will consult on logistics).
Meeting in the village of Umba at 10:00 the beginning of the tour: loading ashore, briefing, going to sea.
Transfer to the ancient stone labyrinth and overnight on the shore.