CREATE TABLE table_70259 ("1-person dive" TEXT, "2-person dive" TEXT, "3-person dive" TEXT, "Surface" TEXT, "Cage dive" TEXT, "Seal/turtle decoy" TEXT, "Catch release" TEXT, "Attached camera" TEXT, "Remote camera" TEXT)

What is the 3-person dive that has none as the 2-person dive?
SELECT "3-person dive" FROM table_70259 WHERE "2-person dive" = 'none'
SELECT "3-person dive" FROM "table_70259" WHERE "2-person dive" = 'none'