Threshold Researcher Trophy in CONTROL Resonant

• Crossing the Threshold: open the garage door west of the Field Office in Central, where a body lies. It leads through the Field Hospital to the Dig Site Threshold.
• Unsupervised Science: six underground FBC Testing Facilities, one in every zone but the Underpass. Each is reached through a pipe and ends in a puzzle. A room behind each holds a power upgrade piece.
• The Last Taxi: seven taxis, one per zone. Get in, answer the phone in the place it takes you, then pick the right taxi three times to get back.

The checklist has every facility and taxi with its solution. PowerPyx has screenshots of each Testing Facility and taxi.