Yes, this is a concern. It's likely to affect the upper ocean, Lidar is the most likely candidate. Lidar mapping from surface craft and aircraft goes down to a few hundred meters in good conditions. If Lidar makes the upper oceans transparent, all submarines will be affected, but nuclear submarines would be much less affected because they can stay deep much, much longer. Conventional boats would have to traverse the now transparent upper ocean every week or so. Same applies to technologies to detect snorkels. Most of the other tech you refer to is more theoretical and it takes a while for them to be developed, if ever. I'm sure the clever folks involved have taken these potential developments in to consideration. In any case, subs are much more likely to be survivable against a peer opponent through the rest of the century than surface craft.Yesterday's announcement news has ushered in a wave of excited chatter regarding our defence future. But this article suggests there may be cause for concern – and a renewed sense of urgency.
Progress in detection tech could render submarines useless by the 2050s. What does it mean for the AUKUS pact?
The first AUKUS-class submarine will be delivered in the 2040s. We may only get about a decade of use before adversaries can easily detect the new boats.theconversation.com
Their assessment predicts that detection technologies may become so advanced by the 2050s, the oceans could become “transparent”. In other words, it will be increasingly viable to detect submarines, whether by measuring disturbances in the physical, chemical and biological signature of the water they pass through, or by detecting any radiation they emit.
If this technological future arrives, it won’t matter how state-of-the-art our underwater defences are – adversaries will be able to sniff them out. And if it happens by the 2050s, as the authors predict, Australia’s new fleet might squeeze in about a decade of use before it starts to fade into obsolescence.