The man, a British citizen in his 30s, is suspected of gross sea drunkenness in connection with the accident.
- We have a detainee who is to be arrested, says Peter Ryman, station manager at the Coast Guard, at a press conference on Wednesday.
Earlier, a Croatian man in his 55s was also arrested, but he was released during the morning.
The suspicions against him have weakened, but still remain.
In addition to the two suspects, interrogations have also been held with several other crew members on the British ship.
Unclear start time
The effort to salvage the Danish ship continues, but it is still unclear when it will actually be lost.
The company that has been hired to handle the work has presented a plan for how it will go.
- Together with the Swedish Transport Agency, we will make a decision on whether we like the plan or if corrections are needed.
The salvage plan can be approved no earlier than Thursday morning.
Shortly after 3 pm on Wednesday, the Coast Guard announced that the ship had begun to sink, something which, however, is not expected to affect the salvage work significantly.
At the same time, it is clear that fuel has begun to leak into the sea.
The Coast Guard monitors the process via aircraft.
- According to the first indications, these are not large quantities, but we will let the flight make a qualified assessment, says Peter Ryman.
In the evening, the Coast Guard announced that the assessment from the flight is that between 30 and 300 liters of oil leaked.
It's probably hydraulic oil.
During the evening and night, work is underway to control the oil spill.
It is also prepared for divers to perform sealing work on the ship.
"The focus for the next 24 hours is to collect oil and ensure that no more leaks," says rescue leader Jesper Bäckstedt in a press release.