Actor Joel Edgerton spotted wearing a Casio

When Joel Edgerton suited up to portray cave-diving rescuer John Volanthen in Ron Howard's Thirteen Lives, the production team reached for a watch that could withstand a flooded cave system without a second thought — the Casio G-Shock GX56BB-1. It's a prop choice that doubles as authentic character detail, and sharp-eyed viewers will clock it on Edgerton's wrist throughout the film's most harrowing sequences.

The GX56BB-1 sits within Casio's King Concept lineup, a sub-family of G-Shock built around maximum size and maximum toughness. Released as part of the GX-56 series, it measures a substantial 55.5mm lug-to-lug and runs on Casio's Tough Solar system combined with Multi-Band 6 atomic timekeeping — meaning it self-corrects via radio signal across six global time calibration stations. The module delivers world time across 31 time zones, a tide and moon graph, and 200-metre water resistance. The signature all-black finish — case, bezel, and strap rendered in matched matte resin — gives it the GX56BB designation and an aggressive, utilitarian presence that no luxury diver can replicate at this price point.

Among G-Shock collectors, the GX-56 King series occupies a respected niche. It is not a heritage grail piece like the original DW-5000C, nor a crossover fashion object like the GM-110. It is a workhorse — bought and worn by outdoor professionals, divers, and military personnel who need atomic accuracy and solar independence in a single sealed package. The BB all-black execution commands a modest premium over standard colourway variants and ages well without showing scuffs.

Edgerton's portrayal of Volanthen is physically committed and largely unglamorous — exactly the register the GX56BB-1 occupies. It is the right watch for a man shown crawling through flooded limestone tunnels in rural Thailand. The costume and props team made a defensible, research-grounded call.

At retail, the GX56BB-1 lists for approximately $150 USD, making it one of the most accessible watches ever featured in a major theatrical production. Grey-market pricing tracks closely to retail given steady Casio supply. The real value here is cultural — a mainstream film legitimizing the idea that competence, not cost, is the correct criterion for choosing a tool watch.