The OP link goes to "forsvaret.dk" wich is the Danish military.

I am a Dane. I think I may be able to offer a perspective on this that
non-Danes will simply miss.

While being a regular reader, for posting this I have created a new
account that will not be used again.

Please excuse me for being a bit verbose, as this is not simple:

ONE
First, I am not positive if this technically happened inside our
territorial waters or just outside, but it seems at least some of it
happened inside. Meaning: We didn't defend our own waters properly.

The area as of now has been blocked for traffic, and we have sent a minor
military vessel there (a fregate) to at least signal that the matter is of
some interest. We can not boast of a large navy or a particularly large
military at that.

TWO
The only part of our military that is in some way of significance is...
our Divers Corps. We have excellent divers, which are given tasks comparable
to those of the more well known US Seals (only more specialized as the
Divers Corps is smaller than the Seals Force and not able to span such a
large set of roles). Suffice to say that they sould be considered
competent in all things on and below water.

These competent people will most likely be capable of investigating the
technical side of this matter fully and rather quickly if they are allowed
to, which it does not seem like.

THREE
In stead it seems like our intelligence agencies (in cooperation with
our so-called "allies") will be tasked with that job. We all know by now
how these information exchanges work (thanks, Snowden) and if there is
even a remote possibility that one of these "allies" have been involved,
we should not expect that to surface from any investigation.

FOUR
Our intelligence agencies... (we have two: A Police Intelligence Agency
and a Defence Intelligence Agency) are more or less at war. The civilian
agency (Police) has literally arrested the head of the military intelligence
agency on charges somewhat similar to "high treason" for what amounts to
be evidence falling totally apart (or so it seems).

FIVE
Also, we are facing a general election. Very soon. The government is going
to fall in less than two weeks - we know this for sure as it has been
declared by their support party. Why?

SIX
Our head of government and the whole administration has tecnically broken
the constitution (on a matter entirely unrelated to Gas or Ukraine).

SEVEN
It seeems there is at lest 50% chance that our current government will not get
re-elected

EIGHT
We operate a multiple-party system, and this election will see at least
two new parties of unknown -- possibly big -- impact (as they were formed
recently by some voter magnets that broke out from previous parties and
have a less than complete policy in place)

NINE
Our current government is dominated by a party (Social Democrats) which
is notoriously "America Friendly". They have sold out critical infrastructure,
engaged widely with the likes of Boston Consulting Group, etc. and ..well,
let's just say examples are legio. This netted a former Head of State a
very well paid job in some Facebook Ethical Committee, and other former
ministers have also been rewarded for their support of American interests
in similar fashions.

TEN
So, we have a coastline. A significant harbour (Esbjerg) is right now being
refactored in order to be able to receive the largest American Navy vessels with the
stated aim of arming Eastern Europe. A pretty large US ship, IIRC, "Endeavour"
recently practiced unloading of tanks and other stuff there. [0]

ELEVEN
The deal has been struck betweeen the government and NATO and/or USA. The
population as such was not consulted on the matter, as we have what is
known as "representative democracy". It was hasted through in the aftermath
of the Ukraine invasion as if it was a necessity for Danmark.

TWELVE
Our defence minister visited the USA a few weeks ago (Sept 1). In extreme
secrecy our government is negotiating a deal with the US that will allow
USA to set up permanent military presence ("bases") on our soil.

TWELVE (B)
This is the same government that will fall in a few weeks, and be replaced
by who-knows-what

THIRTEEN
One possible relevant location of one of these bases has been mentioned
to be... the island of Bornholm

FOURTEEN
This island lies strategically at the entrance to the Baltic Sea. You can
not enter or exit the Baltic Sea without passing it.

FIFTEEN
Russia is not amused. Especially since American forces were preacticing
"extended fire capabilities" there in May. Russia claims that it is a
violation of an agreement tat the Danish govenment as well as USA does
not seem to recognize [1][2]

SIXTEEN
This island is in the general neighborood of the damaged pipelines. That
is, very close.

SEVENTEEN
Few monts ago a large Naval excercise called BALTOPS22 took place in the
general vicinity of said island. The US navy participated [3] eg. "by
executing complex multi-vehicle UUV missions with modified U.S. Navy fleet
assets." - allegedly in the field of mine detection.

EIGHTEEN
UUV means "unmanned underwater vehicle". In [3] it is stated that
increasing the distance these UUVs can be controlled from was important.

NINETEEN
Incidentally, a few years ago, in 2015, the Swedish military actually
found a (cable-controlled) drone loaded with explosives near a Nord Stream
pipeline. The communications cable was "cut off" so it could not detonate.[4]

TWENTY (and closing)
As stated above signifcant US military interests hinges on support from
a Danish government that is about to fall in mere weeks. The current
government has been "very cooperative" to US interests (to put it politely),
and the future government is unknown.

CONCLUDING
Feel free to connect these 20 dots as best you can.

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[0] (in Danish) https://arbejderen.dk/indland/usas-krigsskibe-og-bombefly-in...
[1] https://www.thelocal.dk/20220407/danish-pm-rebuts-russian-am...
[2] https://www.dvidshub.net/news/422733/us-military-makes-histo...
[3] https://seapowermagazine.org/baltops-22-a-perfect-opportunit...
[4] https://www.pipeline-journal.net/news/explosive-laden-drone-...