Cosmeston
Northern European Seas / Celtic Seas
4/5(2 dives by 1 diver)
Type:
Scuba Diving
Entry:🏖️Shore Entry
Tags:
Great ScubaLakeMuck
Contributions by Mark Gosling
About This Dive Spot
Cosmeston is a flooded quarry with a maximum depth of 9 meters. The site features a silty bottom with piles of rocks and seasonal weed growth. Divers can encounter various fish and freshwater eels, although visibility may be poor, particularly after heavy rain. A booking is required 24 hours in advance, and a fee of £4.50 must be paid at the warden's office.
Where is this?
This spotNearby spots
Community sourced coordinates.
Average Ratings
Based on 2 dives by 1 divers
AccessEasy entry
Marine LifeSome life
FacilitiesBasic facilities
CrowdedVery quiet
Current StrengthNo current
Surge StrengthFlat calm
Dive Spot Log Averages
Average conditions based on logged dives & visits
Conditions
Avg. Visibility
1mAvg. Water Temp
11°CAvg. Max Depth
8mActivity
Avg. Bottom Time
30 minTotal Logs
2Unique Divers
1Dive Conditions Planner
Current snapshot, today hourly conditions, and seven-day planning data.
Current snapshot
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Right now
--🌥️Variable
Weekly trends
Marine rhythm
Surface outlook
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Recent Logged VisitsRecent Dive Logs
2 dive logs shared by the community
M
11/2/2025 at 10:12 AM (Europe/London)
Scuba Diving
★★★★★
3/5 OverallMax Depth:8m
Bottom Time:37 min
Water Temp:11°C
Conditions
CurrentNo current
SurgeFlat calm
Detailed Ratings
AccessEasy entry
Marine LifeSome life
FacilitiesBasic facilities
CrowdedFew visitors
Dive Review
“Diveplace: Cosmeston (Wales, Penarth). Visibility: Bad. Water: Fresh. Entry: Shore. Divesuit: Drysuit. Computer: Shearwater Petrel. Start pres 170 bar, end pres 100 bar. Deco: No.”
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M
10/12/2025 at 08:45 AM (Europe/London)
Scuba Diving
★★★★★
5/5 OverallMax Depth:8m
Bottom Time:22 min
Visibility:1m
Detailed Ratings
AccessEasy entry
Marine LifeSome life
FacilitiesBasic facilities
CrowdedVery quiet
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Frequently Asked Questions
What's the best entry point at Cosmeston?
Entry at Cosmeston is detailed in the spot description above. Look for specific landmarks, access paths, and any tide or condition requirements. Local divers often share updated entry tips in their dive logs.
What conditions are best for diving Cosmeston?
Optimal conditions at Cosmeston depend on several factors including tide, wind, and season. Check recent dive logs for current condition reports and patterns. Generally, calmer seas and high tide provide better visibility and easier entry.
What is the maximum depth and typical visibility at Cosmeston?
Depth and visibility information for Cosmeston can be found in the spot details and recent dive logs. Conditions can vary significantly based on weather, tide, and season. Always plan your dive according to current conditions and your certification level.
Are there any safety considerations or local etiquette at Cosmeston?
When diving Cosmeston, respect local regulations, marine life, and other water users. Be aware of any specific hazards like currents or boat traffic mentioned in the spot description. Follow Leave No Trace principles and local diving etiquette.
