I like to imagine the Opportunity waking up, but with its radio damaged from being frozen, it will never hear from Earth again. So, like in the movie Wall-E, the robot slowly treads across the Martian landscape, collecting data that will never reach home.
"My battery is low and it's getting dark" —Mars Opportunity Rover
When NASA received Opportunity's final transmission on June 10, 2018, the rover didn't send the famous, heartbreaking phrase: "My battery is low and it's getting dark." The real data was far bleaker.
The actual final communication was a stream of telemetry indicating that a planet-wide Martian dust storm was choking off the sunlight needed to charge the rover's solar panels.
Opportunity had been operating on Mars for over 14 years, vastly exceeding its original 90-day mission timeline. By early June 2018, a massive dust storm began to blanket Perseverance Valley, where the rover was exploring. Unlike the Curiosity and Perseverance rovers, which are powered by nuclear isotopes, Opportunity relied entirely on solar arrays to generate electricity.
The final data packet received at mission control quantified exactly how bad the situation had become.
The rover reported that atmospheric opacity—a measurement called "tau" that tracks how much sunlight is blocked—had skyrocketed past 10, the highest ever recorded on Mars. Because of this near-total darkness, Opportunity's power generation had plummeted to roughly 22 watt-hours. For context, the rover typically needed to generate hundreds of watt-hours a day to function normally and power the internal heaters required to survive freezing Martian nights.

The famous "My battery is low and it's getting dark" quote was actually a creative summary written by science reporter Jacob Margolis.
He tweeted that the raw data essentially boiled down to those exact words, and the internet immediately adopted the phrase as the rover’s heartbreaking final message.
After transmitting that final low-power alert, Opportunity's batteries drained completely, and it entered a prolonged sleep mode from which it never woke. NASA spent eight months beaming over a thousand recovery commands to the silent rover, hoping the storm would pass and the winds would eventually sweep the dust off the solar panels. The agency finally declared the mission complete on February 13, 2019, leaving the silent rover exactly where it sent its final data point.