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CREG Journal 98 (0-24)
This issue has a cover date of June 2017 and was published on 1 June 2017.

Front Cover (1)
Alice Smith filming Katey Bender on the climb up to Lowe's passage in OFD1. Photo: Footleg

Contents (2)
List of contents and masthead information.

The Adventures of GREG (2)
Illustrations by Adrian Higgins with words by Mike Bedford.

Making Films of the Underground: Video Recording in the Dark (3-6)
Footleg looks at techniques for filming using a variety of the equipment you can buy today, and how he has found it best to use and care for it underground.

The Ultimate in 3D Photography: a Basic Introduction to Holography (7-9)
Mike Bedford investigates the principle of holography. He explains how it builds on stereophotography, which has commonly been used by cave photographers to capture the underground environment in three dimensions, but adds much more.

Auriga – Looking Back at 15 Years of Development (10-12)
Auriga was the first caving software specifically designed for underground use. Its adoption by many expeditions has improved the quality of their survey data by favouring in-cave corrections of survey errors, while also helping orient explorations. Luc Le Blanc, software designer, reflects on his 15 years of developing the Auriga freeware.

We Hear... (13)
News and events – Mike Bedford brings us the latest to impact the world of cave radio and electronics. Introducing the R2B App, 'Holographic' Smartphone, Casio Exilim FR110H Low Light Camera.

Introduction to Digital Holography (14-15)
Javid Khan, Managing Director of Holoxica, explains the principle of digital holography, by which a hologram can be created from a three-dimensional computer model.

Wet & Dry (16)
Ruggedisation, waterproofing & construction techniques – a roundup by Tony Haigh. Should we be moving to Lithium cells? Converting to Lithium cells, Range of batteries available, Protecting against over discharge, Charging procedure.

Outlining the Architecture of the Nicola 3Z Cave Radio (17-19)
Graham Naylor and Pete Allwright provide an overview of the architecture of the Nicola 3Z rescue radio. Using a Xilinx Zynq-7010 system-on-chip, it implements a software-defined radio design in the FPGA and peripheral functions using the ARM A9+ processor core.

Letters and Notes (20)
Loop Orientation, Scanning & Searching, Diary Dates.

Web Watch (20)
Peter Ludwig delves into the Internet again and pulls out some choice plums for our delectation…

Speleo-holography: Making Holograms in the Cave Environment (21-24)
Classically, holograms are made of objects brought to a lab that has a stable, vibration-damped table with a laser and cumbersome equipment. Cave holography brings the essential elements of that lab, assembled as a portable unit, to the speleothems in the naturally-stable vibration-free cave environment. John Klayer presents techniques for making holograms in this setting.