jim suit

Check for Leaks by Richard Castle

This is an illustrated companion website for the above book in which the author recalls his practical (some may even say foolhardy) experiences during the early JIM Atmospheric Diving Suit (ADS) trials.

It is dedicated to those who worked in and with the Atmospheric Diving Group (ADG) of the Royal Naval Physiological Laboratory (RNPL) at Gosport, Hampshire from 1978 to 1986.

Purchase Book


Two JIM suit divers in the tank at HMNB Rosyth

JIMs 18 and 19

An overview of how and why the JIM ADS came to be an area of interest to RNPL, then a research project


Equipment loaded on board RMAS Felsted in preparation for sea trials

Getting Prepared

Some of the less than exotic locations in the UK where our trials and training exercises took place


A mystery man in a JIM suit

A Visual Memoir

A potted history of the ADG via images of people, places and things. Who’s that in the JIM suit? well, read on ...