PICTURE CREDITS
Elena11/: inside front cover; Siamdive/: 2-3; Vectormine/: 4-5; Savva Danylchenko/: 6 (top); Planetpix/Alamy Stock Photo: 6 (bottom); Maxfield Weakley/: 7 (top); Rich Carey/: 7 (bottom left), 39; Vichy Deal/: 8 (clock); Vichy Deal/: 8, 10-11; korkeng/.: 8; DOERS/: 9 (top); Marusya Chaika/: 9 (inset); FLHC 3/Alamy Stock Photo: 10 (top left); dpa picture alliance archive/Alamy Stock Photo: 10 (top right); Stephen Frink Collection/Alamy Stock Photo: 10 (bottom left); Image courtesy of the NOAA Office of Ocean Exploration and Research, Windows to the Deep 2019: 10 (bottom right); 11 (top), 11 (bottom); NOAA: 11 (inset); Kudryashka/: 12-13; Chester Voyage/Alamy Stock Photo: 12; Theodore Trimmer/: 13 (top); Leigh Ann Meeks/: 13 (bottom left); Jody-Ann/: 13 (bottom center and bottom right); Marius Dobilas/: 14-15; hkhtt hj/.: 16; Holli/: 17 (top left); Abdul Razak Latif/: 17 (top right), 17 (bottom right); Nadezda Murmakova/: 17 (bottom left); Double Brain/: 18-19; D.L.Sakharova/.: 19; Sarayut Thaneerat/Alamy Stock Photo: 20 (top left); Tunatura/: 20 (top); wonderisland/: 20 (bottom); chayanuphol/: 21 (inset); Jozef Klopacka/: 22; Galyna_P/: 22 (fish); Antonova Katya/: 22-23 (background); Cassiohabib/: 23, 24 (top), 24-25; lazyllama/: 24 (top) 25 (top and bottom); Mia Stendal/: 26, 27, 28, 29 (background); NASA: 26, 28 (left and right); Kathy Sullivan: 27, 29 (left and right); VicPhotoria/: 29 (bottom); CherylRamalho/: 30-31; Designua/: 31 (inset); Todd Sowers Photography/: 32; Chistousova Natalia/: 34, 35, 36, 37 (spots); Carolee Miot McIntosh: 34 (top, center, and bottom); Katherine Lasdin: 35; Sierra James: 36 (top and bottom), 37 (top); Dogora Sun/: 37 (bottom); Debra James/: 38-39 (top); ChameleonsEye/: 38 (bottom); Nature Picture Archive/Alamy Stock Photo: 38-39 (bottom); Islandjems - Jemma Craig: 39 (center); Charlotte Bleijenberg/: 39 (bottom); Nechitayka/: 40; Vector Posters and Cards/: 44-45; EpicStockMedia/: 44; Wonderful Nature/: 45; Irina Levitskaya/: 47 (top); Malika Keehl/: 47 (center); Benjavisa Ruangvaree Art/: 47 (bottom); Catchlight Lens/: 48; Giedriius/: 49. Cricket Media has made every effort to trace the copyrights of these images.
