During the Pleistocene and Holocene epochs, the global sea level has varied tremendously due to the advance and retreat of glaciers. This animation, created using the Wolfram Language via Mathematica (community.wolfram.com/groups/-/m/t/1609980), shows the visible effect on the coast lines of Europe and the U.K. over the last 500,000 years. It makes use of data from De Boer, B., R.S.W. Van de Wal, R. Bintanja, L.J. Lourens and E. Tuenter, "Cenozoic global ice-volume and temperature simulations with 1-D ice-sheet models forced by benthic d18O records", Annals of Glaciology, 51 (55), 23-33, 2010.