Deep Siren is a Lovecraftian WWII horror fairytale. When the lone survivor of the USS Siren discovers a mermaid while adrift at sea, he finds himself plunged into a world of supernatural horror fathoms beneath the surface. Utilize unique gameplay mechanics as Alex battles to hold on to his sanity.
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Deep Siren is a Lovecraftian World War II horror fairytale. When the lone survivor of the U.S.S. Siren, Alexander Calder, discovers a mermaid while adrift at sea, he finds himself plunged into a world of supernatural horror fathoms beneath the surface. Survive terrifying creatures, navigate alien technology, and discover the secrets of the deep.
Utilize unique gameplay mechanics to understand what is real as Alexander battles to hold on to his sanity.
Inspired by the works of Lovecraft and classic creature feature films.
Steam data © 2025 Valve Corporation. Steam and the Steam logo are trademarks and/or registered trademarks of Valve Corporation in the U.S. and/or other countries. Independent of Valve. Pricing and availability subject to change.






Deep Siren is a Lovecraftian World War II horror fairytale. When the lone survivor of the U.S.S. Siren, Alexander Calder, discovers a mermaid while adrift at sea, he finds himself plunged into a world of supernatural horror fathoms beneath the surface. Survive terrifying creatures, navigate alien technology, and discover the secrets of the deep.
Utilize unique gameplay mechanics to understand what is real as Alexander battles to hold on to his sanity.
Inspired by the works of Lovecraft and classic creature feature films.
Deep Siren is a Lovecraftian WWII horror fairytale. When the lone survivor of the USS Siren discovers a mermaid while adrift at sea, he finds himself plunged into a world of supernatural horror fathoms beneath the surface. Utilize unique gameplay mechanics as Alex battles to hold on to his sanity.
We are not affiliated with IsThereAnyDeal.
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Steam data © 2025 Valve Corporation. Steam and the Steam logo are trademarks and/or registered trademarks of Valve Corporation in the U.S. and/or other countries. Independent of Valve. Pricing and availability subject to change.