China has allowed representatives from Germany, Sweden, Finland and Denmark to board a Chinese bulk carrier at the centre of an investigation into Baltic Sea cable breaches, the Danish foreign minister said on Thursday.

The Yi Peng 3 vessel is wanted in Sweden for questioning over a breach of two undersea fibre-optic cables in November, and has been stationary in waters nearby for a month while diplomats in Stockholm and Beijing discussed the matter.

Investigators quickly zeroed in on the ship, which left the Russian port of Ust-Luga on Nov. 15, and a Reuters analysis of MarineTraffic data showed that the vessel’s coordinates corresponded to the time and place of the breaches.