CSignum, a provider of wireless communications from beneath the surface of water, ice and ground, has completed a £2.6 million funding round to accelerate commercial deployment of its EM2 product portfolio across multiple markets and applications, including water quality monitoring.

The investment supports CSignum’s mission to become an indispensable enabler of AI in the physical world, extending reliable data communications to underwater and below ground environments that have historically been impossible to connect.

Archangels, PXN Ventures, Scottish Enterprise, British Business Bank and a group of US-based angel investors have provided additional investment, reflecting their continued confidence in CSignum’s technology and momentum in multiple markets.

Funding will be used to support commercial expansion and manufacturing scale-up. Since completing a £6m investment with the existing investor group in April 2025, CSignum has moved from pilot projects into volume deployments with multiple UK water utilities and international customers.