CREATE TABLE table_name_81 (operator VARCHAR2, berths VARCHAR2, depth__m_ VARCHAR2)

Name the operator with berths more than 1 and depth of 12.5-15.5
SELECT operator FROM table_name_81 WHERE berths > 1 AND depth__m_ = "12.5-15.5"
SELECT "operator" FROM "table_name_81" WHERE "12.5-15.5" = "depth__m_" AND "berths" > 1