The entrance to the Second Black Box is a technical and consequential Class IV+ rapid, featuring a narrow, boulder-choked channel with powerful hydraulics and limited route-finding options. Paddlers must navigate a series of tight, angled drops between large rocks, with serious pin and entrapment hazards that demand precise boat positioning and expert-level water reading skills. A significant undercut wall on river right and potential wood hazards make this section extremely committing, requiring full commitment and zero margin for error.