OSRS How to Swim Fast Underwater
© gamerblurb.com | Published on 11/23/2025 at 10:33 PM CST (USA)
Moving fast underwater on Fossil Island is easy once you know the trick. With the right gear and a light setup, you can glide through the sea instead of crawling like a snail.
How to Swim Faster Underwater
Equip flippers and keep your total carried weight under 27kg. That’s the rule. Flippers turn your walk into a run animation underwater, letting you swim much faster. If you weigh 28kg or more, your character won’t be able to move through deeper areas and will start drowning instead.
Weapons also stop you from swimming, so unequip anything in your hand before diving. Shields can’t be used either. Just stick to light gear and utility items.
The Right Gear Setup
You don’t need combat gear underwater. Instead, use equipment designed for exploration. The fishbowl helmet and diving apparatus keep your oxygen bar full, which means you can stay underwater forever without worrying about air. Pair those with flippers and you’re set.
Bring a few pufferfish too. They instantly restore oxygen by 15 percent and are handy if you remove your helmet during agility or thieving runs. Keep your inventory light and avoid heavy items like armor, ores, or bars.
Staying Alive and Efficient
Every second counts underwater. If you’re weighed down or missing gear, you’ll move slower and lose oxygen quicker. Use the small island’s bank north of Fossil Island to dump any unnecessary items before diving.
Watch your oxygen meter. If it drops to zero, you’ll lose 10 to 20 mermaid tears and 1 burb but keep the rest of your items. Use nearby air bubbles or pufferfish to refill oxygen if needed.
Final Blurb
Swimming fast underwater is simple once you get your setup right. Stay under 27kg, wear flippers, and leave the heavy stuff behind. You’ll zip through the underwater tunnels like a true sea adventurer instead of a sinking rock.
FAQ
What makes you move fast underwater?
Flippers let you run underwater if you weigh 27kg or less.
What happens if I carry too much?
At 28kg or more, you’ll drown trying to reach deeper areas.
Can I fight underwater?
No, weapons stop you from swimming and shields can’t be used.
How do I keep my oxygen up?
Wear the fishbowl helmet and diving apparatus or use pufferfish and air bubbles.
Is there a way to bank items nearby?
Yes, there’s a bank chest on the small island before you dive north of Fossil Island.
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