SNR G132.7+1.3, known as HB3, stretches across a massive 1.5° x 2.0° in the sky as one of the largest supernova remnants in our galaxy. Despite its size, this remnant is faint in the OIII wavelength, demanding a dedicated 140 hours of exposure to bring out its delicate structure. Captured in LRGB-HOO, this image is our most ambitious project yet, completed in collaboration with the AAA team.