Maelstrom
A whirlpool doesn’t announce itself. One moment the water is moving; the next, you are inside it. Dark, cold, turning. The particular blue-green of water that has no intention of letting go.
Maelstrom is that colour. On some bases it reads with depth and turbulence, darker blues moving within the teal. On others, the same colour sits clear and even at the surface. The same water. Different depths.