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 Location on World Map Mushroom Forest ← Underwater → House on the Hill ↓ Museum Camp

Underwater is a location just off the northern coast of Fossil Island. In order to enter the underwater area, a player must first travel to a small island via rowboat, located at the northern tip of the island (transportation icon ). On this smaller island, a player can then select Dive on the rowboat to enter the underwater section. They will also find a bank on this island, which can be used to quickly grab required items. After a player has travelled here once, a new option is unlocked by using the Museum Camp rowboat, allowing quick travel to this island.

While the fishbowl helmet and diving apparatus are not required to dive, it is heavily suggested that players bring them in order to extend their visit. Flippers can also be worn in order to swim faster. Weapons can be wielded underwater; however, they prevent players from being able to swim. Attempting to access the deeper areas with a weapon equipped or while weighing 28kg and above will cause the player to drown.

Air mechanics

When underwater, an oxygen meter will appear. This bar begins at 100% and reflects a player's supply of oxygen. As long as both the fishbowl helmet and diving apparatus are equipped, the bar will remain at 100%. If not, a player's oxygen will go down by 1% every few seconds. At 10% oxygen, the player's screen will begin flashing red, indicating that they will soon run out of air and drown.

Drowning occurs when a player's oxygen levels drop to 0%. It doesn't cause any harm to the player, but a random amount of mermaid tears between 10 and 20 will be lost if they had any in their inventory. Any tears in the player's bank will be left untouched.

To restore oxygen, players can either enter air bubbles which increase their oxygen by 5% every few seconds, or catch pufferfish, which can instantly restore oxygen by 15% and can be stored for later use.

Underwater features

Drift net fishing

This fishing activity requires at least 47 Fishing and 44 Hunter to begin. To be allowed access to the activity, players must first speak with Ceto, located just north of the anchor rope. 200 numulites are required as payment to enter the instanced area and allowance lasts for a full day. Players can also pay a fee of 20,000 numulites to gain permanent access.

Drift nets are tradeable and can be crafted by using two jute fibre on a loom at level 26 Crafting. Players can store up to 2,000 drift nets by speaking to Annette. These drift nets can then be strung up underwater to catch fish. Players can then chase fish shoals into the drift nets.

Each fish shoal fills the net up by 10% and gives Hunter and Fishing experience based on a player's current levels. Players with a merfolk trident equipped will find it easier to scare fish shoals into their drift nets.

Upon harvesting a fully stocked net, the drift net will be destroyed, leaving just the catch behind. Sardines, anchovies, lobster, tuna, swordfish, sharks, pufferfish, oysters, clue bottles and numulites are all possible rewards from the net in varying amounts. Sea turtles and manta rays can also be obtained, given that they have the fishing level to catch them (80 for sea turtles and 90 for manta rays). Players can use the bank option when the harvest interface is open to bank all the fish caught for a fee of 5 numulites.

Seaweed farming

Located just south of the anchor-rope, two seaweed patches can be used by players with at least 23 Farming. Seaweed spores are required for usage of the farming patch. A nearby mermaid, Mernia, requires 200 numulites to watch over each patch.

Planting gives 19 Farming experience and harvesting yields 21 experience for each giant seaweed picked. A minimum of three can be collected per patch, with the average being around 20–40 depending on one's Farming level.

Mermaid's domain

The entire eastern area is an elaborate Agility and Thieving training arena. To enter, the player must first remove their fishbowl helmet by the request of Mairin, a mermaid which guards the area. There is a pile of fishbowls, which a player can use to store their helmet temporarily as they traverse the area. Without a helmet, players must rely on pufferfish and air bubbles to keep their oxygen levels up.

After entering, players will find a scattered layout of treasure chests and giant clam shells as well as several tunnels, holes and other obstacles, such as currents, which can be traversed. A flashing arrow on the player's screen and minimap indicates which chest or clam currently contains a reward. It should be noted that chests and clams can be looted multiple times after discovering the correct location.

There is a 1/8.5 chance that searching a chest or clam will be successful. On a successful search, a mermaid's tear and glistening tear will always be rewarded, as well as a chance of receiving 20-30 numulites or unidentified fossils varying from small to rare (fossils are obtained this way roughly 1 in every 20 mermaid tears).

Mermaid tears are a form a currency, which can be used only in Mairin's Market. Unidentified small, medium and large fossils, the merfolk trident, seaweed spores and bowls of fish can all be purchased here.

The glistening tears can be traded to Mairin in exchange for experience in one of three ways, which is scaled based on the player's levels:

• Agility and Thieving - 196 Agility and 718.5 Thieving experience per glistening tear if both skills are level 99. These are the base Agility and Thieving experiences.
• Agility - 294 Agility experience at level 99 per glistening tear. The experience is calculated by $1.5*baseXP$. At level 99, the estimated experience per hour is 67,000.
• Thieving - 1,077.8 Thieving experience at level 99 per glistening tear. The experience is calculated by $1.5*baseXP$. At level 99, the estimated experience per hour is 262,000.

Combat

Level 68 lobstrosities can be found in the south-eastern area of the domain. These can only be attacked using a Trident (Magic) or a Brine sabre (Melee). While players are not allowed to use their fishbowl helmets here, there are several air bubbles, which will help keep their oxygen levels up.

Lobstrosities are favoured for their many seed and herb drops.