Knitted in the round and featuring the creatures that inhabit the deepest oceans, this is an easy pattern if you already know how to knit stranded colorwork and this pattern assumes that you do know how to knit stranded colorwork.
If you have not knitted stranded colorwork before then this is an experienced level pattern.

Instructions are given for head sizes 18” (46 cm), 21” (53 cm), and 23” (58 cm)
These correspond to child, small adult and medium-large adult sizes.

Fingering weight yarn.
MC: (deep sea color), CC1: (creature color)
Size 18” (46 cm), MC 88 yds (80 m), CC 36 yds (33 m)
Size 21” (53 cm), MC 106 yds (97 m), CC 40 yds (37 m)
Size 23” (58 cm), MC 125 yds (114 m), CC 44 yds (40 m)

Once we venture past the zone where light penetrates the ocean, the dark depths of the sea are filled with strange and captivating creatures. We know remarkably little about the deep ocean. More than 80% of the ocean remains unexplored. And because it’s difficult to protect what we don’t know, only about 7% of the world’s oceans are designated as marine protected areas.
Even though we know so little about these deep-sea creatures and the ocean floor, commercial fishermen and mining companies are moving in.