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Underwater Attractions


Diving Facts
MIN DEPTH: 14 metres
MAX DEPTH: 22 metres
LOCATION: Entrance - End of slipway track
Exit - Base of Crushing Works
  • The darkness beckons!

  • Darkness
  • Overhead environment
  • Loss of visibility
  • Disorientation
  • Depth
  • Entanglement

Dive Attractions Map
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Compass Bearings List
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Attraction Information

A twinset diver swims up through the tunnel following the guideline on the roof...

The tunnel is concrete-lined throughout so navigation is relatively easy...

A high-visibility guideline runs along the roof and is tied off at either end...
For the more experienced diver with overhead training, we offer the Stone Delivery Tunnel - an 18m long concrete-lined 'cave' cut through the limestone in the days when the quarry was still operational.

Despite being reinforced with a concrete liner along its entire length and wide enough for three divers to travel through side by side, the tunnel should only be attempted by those divers with overhead environment training - even then, only enter if you like your overhead environments dark and spooky!

Located at a depth of 14 metres, the entrance to the tunnel can be found at the end of the track that leads down from the quayside slipway. Once you reach it, you'll discover a thick white cable tied off at the entrance. Running along the roof for the entire length of the tunnel, this high-visibility cable provides a useful guideline for even the most experienced overhead environment diver.

As you progress through the tunnel, be aware that the depth will steadily increase until you reach the exit at 22 metres. Visibility and ambient light levels can varying massively between the entrance and exit to the tunnel so make sure you that you keep your torch switched on even once you've exited the tunnel. We recommend that any diver entering the tunnel carries at least *two* torches.

At the tunnel exit, you'll find yourself very close to the base of the Crushing Works. To locate the Crushing Works from the tunnel exit, fin forward with the wall on your right hand shoulder for approximately 5 metres.
SAFETY FIRST: This attraction should only be entered by divers with overhead environment training. The tunnel is very dark and can be very disorientating! If in doubt, DO NOT ENTER!

20-04-2017   10:54



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Discover the Red Sea with Vobster Quay - 8th to 15th December 2017.


POSTED: 27th April 2017

Vobster Quay doesn't just puddle jump. After trips to Naples last Autumn and Mull in March, Pete Shaw takes the helm for an early season Cornwall fix. Later this year, we have Plymouth weekender, Normandy wrecks and Malta to make full use of the training gained at Vobster and extend confidence and skills into rewarding diving. Interested in trips or training - get in touch, we have options for everyone. Cheers, Tim

POSTED: 24th April 2017


In the market for a new dive computer? If so, you definitely want to check out this new offer from Suunto UK. Just purchase an EON Steel between now and the 30th June and you can claim a FREE wireless tank POD! Offer only valid while stocks last.


POSTED: 21st April 2017

The first of our regular weekly late-opening hours kicks off this evening. From now until late October, we'll be staying open until 9:30pm (exit the water by 9:00pm) every Thursday for divers wishing to take advantage of the long Summer evenings. See you all at the quayside!

POSTED: 20th April 2017


A weekend of boat diving with friends & buddies in one of Cornwall's iconic dive locations. One day £60 for 2 dives, 2 days 4 dives £110.

Porthkerris has amazing shore diving, sheltered from all but Easterly winds, with reefs that drop to 18-19m maximum.

Offshore, accessed by Porthkerris Divers Celtic Kitten... [more]

POSTED: 18th April 2017


From right to left here is Pete Shaw, Vobster Quay instructor being evaluated for his IANTD Normoxic Plus (70m) by Howard Angel, Vobster Quay Technical Instructor, ( who is being evaluated by Tim Clements, Vobster Quay Technical Instructor Trainer). In turn, Tim is being evaluated as a Normoxic Plus IT... [more]

POSTED: 14th April 2017

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