Use an escape rope
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Whirl Islands only exist in Gold, Silver, Crystal, HeartGold and SoulSilver.
You can get Horsea in Dark Cave or Whirl Islands. You'll need to Surf on water to get it.
On Whirl Islands.
go to whirl islands
First, travel to Olivine City. Then, surf Southwest of Olivine to get to a Whirlpool. Then, use a Pokemon with Whirlpool to go across the whirlpool to get into the Whirl Islands.