Could Britain have built an early SOSUS-style barrier?

How early could a SOSUS-style underwater listening line have been installed around Britain?

A simpler fixed hydrophone barrier was technically plausible in the 1920s or 1930s, though Britain did not build one.

This counterfactual separates the mature Cold War SOSUS network from the simpler idea of fixed underwater listening stations. Britain may have possessed enough interwar acoustic knowledge to build a coastal barrier analogous to Chain Home. Such a system would not have destroyed submarines itself, but repeated detections could have narrowed search areas for aircraft and escorts. Its absence shows how an available sensor concept can remain unrealized until institutions, funding, and operational doctrine bring it together.