Serious question about safety as I dont work with UV on a regular basis. I have looked at getting / building a UV to explorer rocks I gather the shorter the wavelength the more that things fluoresce? but also the shorter the wavelength the higher the danger to the eye as we don't see it and so...

This was open at least 2-3 years ago pretty sure there is another open adit near by too. Didn't have any gear with me at the time and it was quite wet looking

I dont know the name but have explored it and dropped the shaft above in an attempt to connect it. DJ who gave us the guided toor described the white clay mineral as a hexagonal plane similar to the clays used for the firebricks across the bay (an excellent place for an explore)

is it where a mineral was discovered ? similar to the clay for the firebricks round the headland ?

So our burner has just started doing this after replacing the sealing rope. Opening the door a smidge (breaking the seal) then waiting before fully opening is defiantly helping a lot as the smoke comes out next to the side of the door that opens the most. Closing the Wash before opening also...

magnetic switch would be simpler and easier to control ... reed switch in box with relay to be main switch and then bring a magnet next to the box to turn it on

Colin discovers a small cave draft while digging a "secret" tunnel. I am impressed with his stealth digging tools. https://www.youtube.com/watch?v=0dYMRj9whp4

This indiegogo looks rather interesting https://www.indiegogo.com/projects/wunder360-s1-first-3d-scanning-360-ai-camera?utm_content=campaigns_one_column7_title&utm_source=sailthru&utm_medium=email&utm_campaign=#/

might be of interest https://petapixel.com/2017/06/26/photographing-hang-son-doong-worlds-largest-cave/

cam across http://www.kickstarter.com/projects/ikegps/spike-laser-accurate-measurement-and-modelling-on?ref=category might be usefull for cave surveys ..

Hi I have come across megagrip (http://www.megagrip.co.uk) they  appear to have cheap but good looking kit. Has any one used the technibat (http://www.megagrip.co.uk/products/Caving/caving_harnesses_technibat.htm) if so is it any good ? Is there anywhere that stocks this stuff to try it on for...

Hi all me and some friends are off to the peak next week. If the weather is good we plan to be outside but if it starts to rain are more than happy to go underground. Any suggestions on places to visit near the Roaches that are safe in wet weather. We all have a bit of experience but mostly in...

Hi all I have a petzl meteor helmet its very comfortable and fits my odd shaped head well. I would like to add a blade mount to it to use a sten. The helmet is made of expanded polystyrene and so drilling is not an option. I was wondering if anyone had ever successfully glued a blade mount to a...