The two active lava flows to the north of the flow field continue to be heavily monitored as they both continue to advance. The further south of the two, which travels to the south of La Laguna Mountain, is only 80 m from the coast, although it moves forwards only incrementally. The furthest north flow has begun to affect the urban centre of La Laguna, including the petrol station at La Laguna crossing, causing a large fire. Due to the possible future path of this flow, preventative evacuations were ordered in the afternoon for people in Las Martelas, Marina Alta, Marina Baja, Condesa and Cuesta Zapata, totally around 150 people bringing the total number of evacuees to 6,600, not including 400 evicted tourists that were transferred to Tenerife at the start of the eruption. This flow is currently being fed by a relatively large flux of lava, and the new Strombolian vent that opened on the afternoon of the 19th October remains active. Elsewhere, findings of underwater studies have been published today, and include that up to 11 ha of underwater ravines have been filled by the lava flows, and a decrease in fluorescence (a proxy for certain marine organisms) of 48% in the first 150 m depth of the water column has been seen.