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Cosmeston

4/5(2 dives by 1 diver)
Type:
Scuba Diving
Entry:🏖️Shore Entry
Difficulty:Beginner
Tags:
Great ScubaLakeMuck
About This Dive Spot

Cosmeston is a flooded quarry dive with a silty bottom, rock piles, and seasonal weed growth. The maximum depth is 9 m. Divers may see various fish and freshwater eels. Visibility can be poor, especially after heavy rain.

Planning details
Reported depth and seasonality.

Reported depth

Up to 9m

Depth note

Maximum depth stated as 9 m.

Typical conditions

Silty bottom with seasonal weed growth; visibility may be poor, particularly after heavy rain.

Safety & access
Hazards, restrictions, and required precautions.

Hazards

Low visibilityRestricted access

Safety notes

Visibility may deteriorate after heavy rain.

Access restrictions

Booking required 24 hours in advance.

Where is this?
Map location of Cosmeston
This spotNearby spots
Community sourced coordinates.
Get DirectionsView on Dive Map
Local intel
Community notes to help plan your visit.

Access, coral, life, crowds, and facilities.

Access

A booking is required 24 hours in advance and payment is made at the warden’s office.

Aquatic Life

Various fish and freshwater eels may be encountered.

Facilities

Payment is handled through the warden’s office.

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
1m
Avg. Water Temp
11°C
Avg. Max Depth
8m
Activity
Avg. Bottom Time
30 min
Total Logs
2
Unique Divers
1
Dive Conditions Planner
Current snapshot, today hourly conditions, and seven-day planning data.

Current snapshot

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Weekly trends

Marine rhythm
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Recent Logged VisitsRecent Dive Logs
2 dive logs shared by the community
M
Mark Gosling

11/2/2025 at 10:12 AM (Europe/London)

Scuba Diving
★★★★★
3/5 Overall
Max 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
Mark Gosling

10/12/2025 at 08:45 AM (Europe/London)

Scuba Diving
★★★★★
5/5 Overall
Max 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.