Slow waves meander westward out in the deep ocean south of Australia. Sometimes they carry with them carry large eddies, whirlpools over 161km across. But every so often, these whirlpools combine into double whirlpools and travel across the ocean 10 times faster than the rest of the whirlpools, moving in sync for months and potentially transporting minerals and nutrients with them.
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Humans are pretty jaded these days. We can write most of the strange phenomena we see off as science (or we honestly don't care). But when Roman philosophers such as Pliny the Elder witnessed moonless nights glow bright like the day, it definitely made an impression. Others since then have been awestruck by these "bright nights", too.