Nice try Doom, but no cigar.

Location, location, location.

 

Hydrates would form at "bottom" sections of the pipe. At 70 m Bornholm is close to a 

top. There are other points deeper and more likely based on geography, temperature

etc. But they were not "convenient".

And 4 explosions within 17 hrs in 4 pipes, same spot, 2 nonoperating for 1 yr, 2 non

operating for 2 months? Why it took so long for the NS2 explosions? 

In any case the pipe will tell us if it was an "inside" or "outside" explosion job. 

 

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It is concluded that there are two main mechanisms of water accumulation in pipelines due to gravity i.e. accumulation at bottom section of the pipe and accumulation at the base of uphill/ sagging sections of the pipe. The accumulation phenomena is a compound effect taking place at the base of uphill section of the pipe for aforementioned reasons and is clearly visible in figure 2

 

https://www.witpress.com/Secure/elibrary/papers/MPF11/MPF11022FU1.pdf