La Palabra Del Día: "subterráneo"
subterráneo ( soob-teh-rrahn'-eh-oh )
adjective ( underground; subterranean )
There are many native English speakers here, most of us can offer great suggestions to the English sentences. I will do my best to go through them all, too. For the Spanish sentences, edit your posts according to the native Spanish speaker's suggestions. Use today's Word of the Day in your own Spanish sentence (and include the English translation as well). Try to use the word in a completely new way and vote on the sentences you like best. The winner will be chosen based upon the correct use of the word as well as the number of votes.
Guidelines:
Write sentences at least 5 words long, but don't write a paragraph either. Write your Spanish sentence, but include the English translation as well. Make the corrections suggested by other users and moderators in the comments section (try not to use personal pronouns unless absolutely necessary). Use your own words! (Don't use a translator, copy from a book, use song lyrics, etc.) Please keep political, religious or personal statements to a minimum. This is a practice game.
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Examples:
1: Nadamos en un río subterráneo en Quintana Roo.
We swam in an underground river in Quintana Roo.
2: Mi abuelo cree que hay una civilización subterránea bajo el mar.
My grandfather thinks there's a subterranean civilization under the sea.
Here Comes the Sun
9 Answers
Si tienes mucho dinero, puedes construir una oficina subterránea.
If you have a lot of money, you can build an underground office.
En la cueva de estalactitas hay una sala subterránea enorme donde solían dar conciertos
In the stalactite cave there is a huge underground hall where they used to give concerts
Las fuentes de agua subterránea, debido al aumento de la población en el mundo, se revalorizan como reserva de agua industrial y de agua no potable con cada día que pasa.
The groundwater resources, owing to the increasing population of the world, are appreciating in value as industrial and non-potable water reserves with each passing day.
No estoy seguro de ambos frases así que por favor corrijan mis frases si hay cualquier error. 
Subreterrneo un día,subterrneo el próximo.
Mi hijo trabaja para el gobierno en el Departamento de Meteorología. Todo el mundo cree que debe saber acerca del tiempo, pero de hecho su oficina se dedica a los recursos del agua subterránea. La mayor parte de Australia es bastante seca, por consiguiente este conocimiento es importante.
My son works for the government in the Bureau of Meteorology. Everyone thinks he must know about the weather, but in fact his office works on groundwater resources. Most of Australia is quite dry so this knowledge is important.
Note: Subterráneo can also mean an underground transportation system. Americans call it the subway, and the British call it the "Tube" (I think)
Actualmente el subterráneo más largo del mundo en activo se encuentra en Japón: es el túnel Seikán, que con 53,85 kms. de longitud une Honshu y Hokkaido bajo el mar. De esos casi 54 kms., 23,5 kms. se encuentran bajo el mar, a 100 m. por debajo del fondo marino, y a 240 metros bajo el nivel del mar.
At present the largest tunnel in use in the world is found in Japan. It the Saikán Tunnel, which being 53.85 kms long unites Honshu and Hokkaido under the sea. Of those almos 54 kms. 23.5 kms are below the sea a 100 meters below bottom of the water and at 240 meters below sea level.
Es algo que no se puede explicar, pero todos los tesoros se encuentran bajo tierra (en el subterráneo) , nunca hay tesoros volando por el aire. I have left the original in inverted commas, as it is quite funny, by mistake)
It's inexplicable, but all treasure is found underground, there is never a treasure to be found flying about in the air.
Sólo hay dos especies de mamíferos que son eusociales; las dos son dos tipos de ratas topo, las cuales viven en sistemas de túneles subterráneos que los obreros cavan.
There are only two species of mammals that are eusocial; the two are two types of mole rats, which live in systems of subterranean tunnels that the workers dig.
Mi hijo va extracción de oro en las minas subterráneo en Victoria.
My son goes gold mining in underground mines in Victoria.
