How do I access the hidden cave with the legendary fish clues?

To access the hidden cave with the legendary fish clues in Red Dead Redemption 2, you must first complete the mission ''A Fisher of Fish'' given by Jeremy Gill. This mission becomes available in Chapter 4, after you have completed the main story mission ''Angelo Bronte, A Man of Honor.'' Jeremy Gill is located at Gill Landing, a small dock northeast of Flat Iron Lake. Once you accept the mission, he will provide you with a map and task you with catching 13 legendary fish scattered across the game world.\n\nOne of the legendary fish, the Legendary Smallmouth Bass, is located near the Elysian Pool, a large body of water northeast of Annesburg. To find the hidden cave, you must first catch this fish. The cave entrance is located just north of the Elysian Pool, near the waterfall. Look for a narrow path leading behind the waterfall, which will take you into the cave. Be prepared for a challenging climb, as the terrain is steep and slippery.\n\nInside the cave, you will find a series of murals and carvings that provide clues about the locations of other legendary fish. These clues are cryptic and require careful observation to decipher. For example, one mural depicts a fish with a distinctive pattern, which corresponds to the Legendary Largemouth Bass found in the swampy areas of Bayou Nwa. Another carving shows a fish surrounded by rocks, hinting at the Legendary Rock Bass located in the Dakota River.\n\nTo navigate the cave effectively, bring a lantern or use your in-game flashlight (press L1/LB to equip it). The cave is dark, and some areas are difficult to see without proper lighting. Additionally, watch out for bats and other wildlife that may startle you. If you encounter any enemies, such as rival fishermen or predators, use your weapons to defend yourself. A shotgun or revolver is recommended for close-quarters combat.\n\nOnce you have explored the cave and deciphered the clues, you can use the information to locate and catch the remaining legendary fish. Each fish requires a specific bait or lure, which can be purchased from bait shops or crafted using materials found in the wild. For example, the Legendary Bluegill requires the Special Lake Lure, which can be bought from the bait shop in Lagras. Make sure to equip the correct lure before attempting to catch each fish.\n\nPractical tips for accessing the hidden cave include saving your game before entering, as the climb can be tricky and you may fall. Additionally, bring plenty of health items, such as tonics and food, in case you encounter enemies or take damage from falls. If you are having trouble deciphering the clues, consider using an online guide or map for additional assistance. Finally, take your time exploring the cave and enjoy the atmospheric environment, as it is one of the most unique and hidden locations in the game.\n\nIn summary, accessing the hidden cave with the legendary fish clues requires completing the ''A Fisher of Fish'' mission, catching the Legendary Smallmouth Bass, and navigating the cave behind the Elysian Pool waterfall. Use the clues inside the cave to locate the remaining legendary fish, and be prepared for challenges such as darkness, wildlife, and difficult terrain. With patience and careful planning, you can uncover all the secrets of this hidden location and complete Jeremy Gill''s mission.