We perform an out-of-distribution analysis of ~12,000,000 semi-independent 128x128 pixel^2 SST regions, which we define as cutouts, from all nighttime granules in the MODIS R2019 Level-2 public dataset to discover most complex or extreme phenomena at ocean surface. Our algorithm (Ulmo) is a probabilistic autoencoder, combines two deep learning modules: (1) trained on ~150,000 random cutouts 201...