Overview
- A visitor filmed two people stepping off the designated boardwalk and walking on the colourful mats around Grand Prismatic Spring on July 18, and the clip has since been viewed millions of times.
- Park officials warn the pale crust around thermal pools can be only a few centimetres thick and hide near‑boiling water, with the pool center measured at about 87° C (188° F), which can cause fatal burns on contact.
- The rings of orange, yellow and green are living thermophilic microbial mats that grow only millimetres a year, so a single footprint can crush cells, change water flow and leave scars that last years or decades.
- Federal rules require visitors to stay on boardwalks in thermal areas and past violators have faced fines, park bans and jail time; coverage so far does not show consistent public confirmation that the two people in the video have been identified or charged.
- The viral footage has reignited public outrage and calls for enforcement, and it could prompt renewed Ranger patrols, investigations into the incident, and wider attention to protecting both visitor safety and Yellowstone’s scientific resources.