Black Rock Processing Control Bridge. Head back down to the walkway by following the signs for Black Rock Processing then cross the bridge go up the stairs to the right and drop down into. The pathbridge leading to the Black Rock Processing is now accessible.
So the first step is to finish the Main Mission Old Boys Club at the end youll get clearance level 4 which youll need. You do that by going through the Oceanview Motel. Go into the third room and pick up the key.
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Then head towards the firebreak where you made the screenshot but dont go through the black rock door or whatever that monstrosity is. This time whoever the bridge from the Black Rock Processing door is extended and we can walk across. We can get there via a convenient corridor that drops us down after the Security Check gate but its a fall from very high so itll lead to some damage. First head for maintenance and then follow the signs to the Black Rock Processing area.