That sentence is present tense. "Is" is a present tense linking verb.
The Dark Tunnel was created in 1944.
Dark at the End of the Tunnel was created on 1990-02-20.
what is the preposition and object of the sentence "i am going into the dark cave and tunnel
Dark isn't a verb and doesn't have a past tense form.
Dark: No sunlight reaches it. Cold: No sunlight reaches it. Noisy: The sounds gets reflected along the walls of the tunnel.
No
The duration of Dark of Night is 1500.0 seconds.
Dark Night - song - was created in 1985.
The Dark Night was created on 2008-09-15.
A Dark Night's Passing was created in 1921.
Dark of Night ended on 1953-05-01.
Dark of Night was created on 1952-10-03.