Former Splash Damage Veterans Form Underdog to Build ZERO Sievert 2, the Co-op Sequel to the Cult Indie Extraction Hit
London, UK, April 30, 2026 – Indie publisher Modern Wolf today announced ZERO Sievert 2, the co-op sequel to the cult indie extraction shooter ZERO Sievert
Developed by Underdog, a new London-based independent studio formed by former Splash Damage veterans, in partnership with Luca Carbonera of CABO Studio, ZERO Sievert 2 expands the world of Zakov around the feature fans have asked for most: multiplayer co-op, alongside deeper lore, new systems, and an evolved 2.5D visual style.
The original ZERO Sievert began as a solo project built by Luca Carbonera in his bedroom. It went on to do what few one-person indie games manage: find a large audience, sell over 600,000 copies on Steam, and build a loyal community around its punishing survival loop that kept players coming back for “one more run”.
The ZERO Sievert community helped make the sequel possible. From wishlists and reviews to Discord feedback, videos, guides, mods, and years of support, ZERO Sievert grew because fans kept coming back to Zakov. Soon, they’ll be able to bring their friends with them.
Together, squads of friends can push deeper into Zakov, turning the first game’s lonely one-more-run tension into shared moments of panic, questionable decisions, and hard-earned extractions.
Leading development is Underdog, a new London-based indie studio built by former Splash Damage veterans with years of experience making multiplayer shooters. Founded in 2025 by Giuseppe Navarria and Antoine Fion, Underdog brings that experience to the challenge fans have been asking for most: turning ZERO Sievert’s tense solo extraction loop into co-op without losing what made it special.
“As a fellow Italian, I’m proud of what Luca achieved with ZERO Sievert,” said Giuseppe Navarria, Co-Founder of Underdog. “He was one of the first to show how well extraction could work from a top-down perspective, keeping the tension, loot and risk, but stripping away some of the more toxic PvP-heavy edges of the genre. ZERO Sievert 2 is our chance to honour that foundation, then let you bring your friends into the mix.”
For Luca Carbonera, seeing ZERO Sievert grow from a solo personal project into a full co-op sequel still feels surreal.
“When I started in my bedroom as a solo indie dev with just an idea, I never in my wildest dreams imagined it would grow into this,” said Luca Carbonera, creator of ZERO Sievert and founder of CABO Studio. “This sequel exists because fans believed in it and supported it. What matters to me now is that it still feels like ZERO Sievert. Underdog understands what made the first game work, and they have the multiplayer experience to take it somewhere I could not have taken it alone.”
Underdog is backed by Paul Wedgwood, co-founder and former CEO of Splash Damage. His own studio journey began over 25 years ago in the late-90s PC modding scene, with a small bedroom team that grew into one of the UK’s best-known online shooter studios. For Wedgwood, the appeal is helping Underdog keep that early-stage hunger while avoiding some of the mistakes that often only become obvious later.
“The games industry has gone full circle,” said Paul Wedgwood, CEO of Modern Wolf and Executive Chairman of Underdog. “AAA will always matter, but at that scale it gets harder to take real creative risks. Right now, a lot of the most interesting work is coming from small teams again: people close to the game, close to the players, and willing to bet on ideas that would never survive a committee. That is what excites me about Underdog.”
Across Early Access, launch, and post-1.0 support, the ZERO Sievert community has helped shape the game through feedback, bug reports, videos, mods, guides, and a steady conversation with the team. That same open development rhythm will continue as ZERO Sievert 2 moves forward.
Underdog Website: https://underdog.ltd
Modern Wolf Website: https://modernwolf.net/Zero_Sievert_2
About ZERO Sievert 2
ZERO Sievert 2 is the co-op sequel to the cult indie extraction shooter ZERO Sievert. Set in the dangerous world of Zakov, it expands the original’s tense survival, looting, and extraction loop with multiplayer co-op, deeper lore, new systems, and a new 2.5D visual style.
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About Underdog
Underdog is a London-based indie game studio, formed by former Splash Damage veterans Giuseppe Navarria and Antoine Fion. The studio specialises in co-op and collaborative multiplayer games built around teamwork, tension, improvisation, and memorable stories between friends.
About Modern Wolf
Modern Wolf is a London-based indie game publisher focused on original, developer-led games with strong creative identities. Its catalogue includes ZERO Sievert, Void Sols, Out There: Oceans of Time, and Rogue State Revolution, and more.
About CABO Studio
CABO Studio is the Italian studio founded by Luca Carbonera, creator of the original ZERO Sievert.
