This workshop, a joint effort of Camera Culture, Signal Kinetics, and Responsive Environments, explores the innovations and challenges in extreme sensing, which can detect information beyond human perception and conventional sensors. We will encourage participants to share the sensing challenges they face in their work, and collectively brainstorm potential solutions throughout the workshop. We will discuss how emerging cameras can capture additional light dimensions and reveal hidden information, such as seeing around corners and turning objects into cameras. We will also explore how flexible wireless antennas can find items inside closed boxes or behind occlusions, and how battery-free underwater sensors can monitor climate change. Finally, we will talk about deploying sensing devices in the wild to sense humans and animals across our planet and on rovers and spacecraft for explorations beyond planetary boundaries.