Conversation so far:
What was underworld?
album would be titled Underworld.
When was the album released?
a release date of July 24, 2015.
How was the album received?
CANNOTANSWER.
When did the band take a break?
2017.
What was the reason for the break?
due in part to his commitment to Adrenaline Mob.
Whose commitment?
singer Russell Allen.
Did the band tour for Underworld?
CANNOTANSWER.
Are there any other interesting aspects about this article?
The band began recording the drum tracks for the new album on September 9, 2014, and planned to release the complete recording.
Did the they release it?
planned to release the complete recording by the spring of 2015.
Did they get back together?
it was announced during a January 2018 interview with Metal Nation that the band had plans to get together.

Question: What else can you tell me about their time apart?
Self-contained rewrite: What else can you tell me about Symphony X's hiatus, in addition to the reason for the hiatus?