A statement from the agency gave approval for an anchor-position vessel to operate in German waters, reversing a decision that work could only begin again in May.
However, local media said the restart could still be delayed by legal action from environmental groups as the remaining stretch of the pipeline runs through the edge of a conservation area for birds.
BSH has limited construction work to a maximum of 30 days per construction phase, each of which must be followed by a 14-day break.
Nord Stream 2 AG said despite the approval, work in German waters was unlikely to resume immediately.
Earlier this month, US lawmakers agreed to extend sanctions on Nord Stream 2, just as Moscow vowed to restart construction.
It is noted that the U.S. State Department has already warned the European companies that help in the construction of the pipeline about possible sanctions.
Soon, the U.S. State Department should publish a report about companies involved in the Nord Stream 2 construction. The report might include the companies that deal with the insurance, helping to lay the undersea pipeline, or verify the project’s construction equipment.