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Reason: Gen III in use.
During the first time the player enters this tunnel, Peeko is kidnapped by a Team Magma Grunt or Team Aqua Grunt who was seen stealing the Devon Goods or Devon Parts earlier. After a battle with the grunt, he returns the Devon Goods or Devon Parts, and the player returns Peeko to Mr. Briney, allowing him to offer a ferry from Route 104.
When the player accesses the tunnel from Verdanturf Town, two people can be found separated by the two rocks, asking the player to use Rock Smash. The man will give the player HM04 Strength (Ruby, Sapphire and Emerald) or Aggronite (Omega Ruby and Alpha Sapphire).
Caves, Tunnels and Mountains
Rusturf Tunnel · Island Cave · Granite Cave · Desert Ruins · Jagged Pass · Fiery Path · Mt. Chimney · Meteor Falls
Scorched Slab · Ancient Tomb · Mt. Pyre · Shoal Cave · Aqua Hideout · Magma Hideout · Seafloor Cavern
Cave of Origin · Sky Pillar · Victory Road · Sealed Chamber · Altering Cave E · Artisan Cave E · Desert Underpass E · Marine Cave E · Terra Cave E
Places of Interest
Devon Corporation · Oceanic Museum · New Mauville · Mirage Tower · Weather Institute · Safari Zone · Mirage Island
Battle Tower RSE · Battle FrontierE · Trainer Hill E · Abandoned Ship RSE · Battle Maison ORAS · Battle Resort ORAS
Mirage Spots ORAS · Sea Mauville ORAS · Secret Islet ORAS · Secret Shore ORAS · Secret Meadow ORAS
|Other regions: Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola · Galar (Isle of Armor · Crown Tundra)|