The 1808 mystery eruption is a large volcanic eruption (VEI-6) conjectured to have taken place in late 1808, possibly in the southwest Pacific. This eruption is suspected of having contributed to a period of global cooling that lasted several years, analogous to how the 1815 eruption of Mount Tambora (VEI-7) led to the Year Without a Summer in 1816. A VEI-6 eruption is comparable to the 1883 eruption of Krakatoa.