But gradually the walls moved farther and farther back, finally peeling away entirely as the stream carried the two launches into a great vaulted underground chamber.

• 但逐渐地，石壁离他们越来越远，最后终于被远远的抛开，水流于此时将二人带入一个巨大的地下洞窟。这地方足有一个太空港那么大。