New area restricted to navigation for boats <15m around Barbate/Cadiz coast, at least until Aug20th
http://radioavisos.salvamentomaritimo.es/
NavWarning 1971/2021 shows coordinates

Addition
Following the advice given by "Orcas Marinas" Spanish organization, reported on the OCC NewsLetter, an additional advice/point of view from NOAA, tubular bells or "firecrackers"

https://response.restoration.noaa.gov/about/media/how-do-you-keep-killer-whales-away-oil-spill.html 
Any idea what power should these "submarine firecrackers" have? There are commercially available submarine explosive cartridges used to warn scuba divers, would they be ok? Too powerful?
regards
rr