The speedily repaired Japanese sinkhole is sinking again.

Fukuoka Mayor Soichiro Takashima posted a statement on Facebook on Nov. 26 that the ground had fallen seven centimetres.

Police closed part of the road for a short time Saturday but it was reopened later that day after experts confirmed its safety.

Earlier this month, a 30-metre wide, 15-metre deep hole swallowed a section of road in downtown Fukuoka, Japan.

In a testament to Japanese engineering and efficiency, the hole was repaired and reopened a week later, astonishing people around the world.

Local media reported that, according to experts, the special mix of soil and cement used to fill the hole when it first opened might have compressed the layer of soil underneath causing the road to re-sink.

Takashima also referenced the 6.9-magnitude earthquake that struck off the coast of Fukushima last week, according to the translated text in a separate Facebook post but did not directly say it caused the latest collapse at the sinkhole site.

The mayor apologized for not warning residents the ground could sink again and assured them that experts will keep monitoring the street.