In-person BTS lectures to resume this month

14 October 2021

Following 18 months of unprecedented living and working under a cruel pandemic, a sense of normality is gradually returning as the British Tunnelling Society (BTS) resumes its highly-acclaimed in-person lectures at the Institution of Civil Engineers (ICE), London.

Having relied on streaming lectures live over YouTube during the worst of the Covid-19 emergency – lectures which nevertheless have seen impressive global audiences – the first lecture of the resumed in-person programme will be on Thursday 21 October at the ICE, starting 18.00 (BST). The lecture will be streamed simultaneously via YouTube.

Dr Donald Lamont MBE and Roy Slocombe will discuss the topic of ‘Low, intermediate and high-pressure compressed air work’ with reference to the launch of the revised BTS Compressed Air Working Guide (CAWG). The document is now called ‘Guidance on good practice for work in compressed air’.

According to the BTS, ‘the lecture will explore the phenomenon of saturation and specifically address some of the important differences between saturation exposure techniques as used in tunnelling, compared with saturation exposure techniques in diving.

‘It will also seek to explain the BTS CAWG opinion that ≈3.5 bar(g) is an appropriate pressure at which to move to mixed-gas breathing during construction, which exploits the differing hydro-geological characteristics of the Lower Aquifer strata, often involving a combination of partial cut-offs and pumping using both surface dewatering systems and in shaft/tunnel techniques.”

The lecture will begin at 18.00 and will also be streamed live over the YouTube platform at

Past BTS meetings can still be viewed at