Translated from NOS TV in the Netherlands:
“Humpback swam back out to sea’
The humpback whale seen this weekend in the Oosterschelde estuary is almost certainly back in the North Sea. Cyclists on the storm surge barrier have seen this afternoon that the animal swam out, says the foundation SOS Dolphin.
Earlier today things still looked bad for the whale. It swam in the east of the Oosterschelde and it was questionable whether it could find the “exit” again and whether it would dare. After 14:00, the animal was not seen.
But tonight, Jolanda Meerbeek of SOS Dolphin got a liberating phone call from a family who had cycled over the flood barrier. “At the first pillar they saw a meters long animal swimming out. It was in the lee of the pier and slid as it were into the sea. They also saw it exhale, a great jet emerged from the blowhole. When it was through the barrier, they saw it swim away to the north.”
See also here.