On May 17, 2008, Deep announced a partnership with ZST to share fighters, co-promote shows and eventually unify the promotions.

As a result, a number of Japanese fighters, such as Ryo Chonan and Ikuhisa Minowa, started their careers fighting in DEEP before moving on to larger and more famous MMA promotions.

Deep is also known as one of the few major Japanese organizations to cultivate Korean talent, including Dong Hyun Kim, Chan Sung Jung, and Doo Ho Choi - all of which have moved on to successful careers in the Ultimate Fighting Championship.

On February 22, 2008, Deep implemented the weight division system created by Nevada State Athletic Commission (NSAC) for its male fighters.

However, low levels of interest and dismal tickets sales led DEEP to cancel the event.