and touch the solar panels, sticking some dust particles to it, before leaving the solar panel. The sand trickle resulted in a boost in power of 30 watt-hours per sol. In July 2021 three papers studying Mars' interior structure were published. Seismometer data confirms that the center of Mars is molten. The crust of Mars is thinner than expected and may have two or three sub-layers. In January 2022, InSight went into safe mode due to a regional dust storm in the area, which caused a reduction in sunlight. During its time in safe mode, all but essential functions were suspended. It left safe mode on 19 January 2022 and resumed normal operations, however all science instruments were left off in the mean time. As of May 2022, Insight has recorded 1,313 Marsquakes. The seismometer (SEIS), radio experiment (RISE) and the weather instruments (TWINS) continue to operate as the lander's Mars surface mission was extended by two years, until end of December 2022. Heat Flow and Physical Properties Package On 28 February 2019, the Heat Flow and Physical Properties Package probe (mole) started digging into the surface of Mars. The probe and its digging mole were intended to reach a maximum depth of but it only went about , or three-quarters of the way out of its housing structure. After many attempts, the effort was given up as a failure in January 2021. In October 2019, the researchers at JPL concluded that the soil on Mars does not provide necessary friction for drilling, causing the mole to bounce around and form a wide pit around itself rather than dig deeper. They attempted a maneuver called in which they pressed the side of the scoop against the mole location to pin the side of the wall of the hole and increase friction. Pinning was initially successful, but then the mole backed out of its hole after a few weeks, suggesting the soil is accumulating below the mole. In February 2020, the team reevaluated the risks of pushing the scoop directly against the back cap of the mole, and determined the procedure to be acceptable. In June 2020, the team reported that the mole was finally underground, and was being evaluated to determine if the mole was able to dig as designed. On 9 July 2020, it was revealed that images taken on 20 June 2020 showed the mole bouncing again, indicating