def METHOD_NAME():
    """Corrupt 511: Dungeon tiles Beach cave 3?"""
    img511 = dungeon_bin[511].decompress()
    # Make every second byte 2
    img511new = bytearray(len(img511))
    for i, b in enumerate(img511):
        if i % 2 != 0:
            img511new[i] = img511[i]
        else:
            img511new[i] = 2
    dungeon_bin[511] = FileType.COMMON_AT.compress(img511new)