Philip Sargent has been on expo in the following years:
Philip Sargent or "PhilS" (Pembroke 1972-75, Wolfson 1975-79, Tackle Sargent 1981-82)
Expedition 1982, 1983 and 2017.
Even in those days he was a relatively elderly caver, having only taken up caving seriously with CUCC in 1980 after having returned from a one-year post-doc out of the UK. This was despite having enjoyed the delights of P8 in claggies when he was a fresher in 1972.
Father of Michael (expos 2014-2017)