A subcontraoctave is a musical term that means an octave lower than the contraoctave.
The word subcontraoctave is used in music to talk about very low sounds.
Examples:
The subcontraoctave is the lowest note on the piano.
In the song, the subcontraoctave is played by the big drum.
The subcontraoctave is so low that you can feel it in your feet.
The subcontraoctave is like the sound of a giant monster!
When the subcontraoctave plays, the whole room shakes.
The subcontraoctave is so low, it feels like it's coming from the ground.