According to a press release, the band decided to record Into the Great Unknown in Bangkok, Thailand, having already come up with ten possible songs to use, and used the facilities of Karma Sound Studios.

The release also stated that H.E.A.T took inspiration at the modern resurgence in public attention, particularly among young adults, of older artists considered "classic rock heroes" such as Foreigner, Journey, and Whitesnake.

[4] Writing for Louder, music critic Dom Lawson praised the release for featuring a "thrilling formula that made the Swedes’ previous albums such a goofy delight."

He remarked that the "effervescent presence and towering voice of frontman Erik Grönwall make everything from... sound vital and timely without sacrificing any of that mid-80s sheen."

Lawson concluded, "The best way to get drawn into H.E.A.T’s world of singalong euphoria is to catch them live, but this album will provide more than enough dizzying, life-affirming joy in the meantime.