The Nord Stream pipeline catastrophe. The West is the only party able and committed to destroying it. The absence of immediate reaction to the explosions is the evidence

Logically, the place, time, and detonation scheme matches the West (especially the US) commitment (refer to Biden and Nuland speeches) and capability to destroy the Nord Stream pipeline. Within Bornholm island, a CIA base is situated. The US navy has complete control over the Baltic sea and especially in the vicinity of the narrow passage from the Baltic sea into the North sea. 

The reaction to explosions first came from the seismological community (first Sweden and then Norway, Germany, ...) that reported next morning relatively large seismic events with magnitudes of 2.3 to 2.7 corresponding to several hundred kg of TNT near the sea bottom. Such a yield is similar to an underwater bomb and this makes the absence of an immediate alert to be inappropriate behavior of the maritime authorities of the surrounding countries. If it would be a WWII underwater bomb, all ships in the Baltic sea were at high risk. 

Only accurate knowledge of the explosion's nature could be the reason for no reaction. The hydroacoustic waves in the Baltic sea were definitely detected within tens of seconds after the explosion by thousands (if not tens of thousands) of extremely sensitive detectors (search for submarines) and the location of the explosion was immediately determined within a few meters.