The phrase "deep fissures" refers to deep cracks or splits in something, typically referring to something solid like rock or the ground. Full definition
A year - long Australian government - led inquiry into banking practices is exposing deep fissures in the country's banking sector. (finews.asia)
Back at the current show at Lehmann Maupin, Varejão walks by a wall of large canvases in earth tones with deep fissures across their surfaces. (artsy.net)
According to David Lammy, the MP for Tottenham, the «cracks that already existed between the police and the community became deep fissures». (en.wikipedia.org)