(1) the underground ::
metroa(2) underground station ::
metro geltokia(3) underground train ::
lurpeko tren(4) underground water ::
lurpeko ur(5) underground railway ::
lurpeko trenbide(6) by underground ::
lurpeko arabera(7) go underground ::
go lurpean(8) underground economy ::
lurpeko ekonomia(9) underground passage ::
lurpeko pasabidea(10) underground river ::
lurpeko ibai