This is the 3896th most frequent Spanish word.
túnel
A "túnel" is a passageway or underground route.
Here 'túnel' refers to a passageway constructed under or through an obstacle, commonly natural formations like mountains.
El túnel bajo la montaña es muy oscuro.
The tunnel under the mountain is very dark.
In this example, 'túnel' denotes a specialized facility used for aerodynamic analysis.
El túnel de viento es usado para pruebas aerodinámicas.
The wind tunnel is used for aerodynamic testing.
In this case, 'túnel' can symbolize a passage or a metaphorical phase towards something, often idealized in dreams.