seal

The latter elements suggest the hearth was intentionally sealed with a mixture of guano and sand, which can protect plant materials within the hearth from catching fire—conditions needed to create tar.

According to eyewitnesses, the city's bus station has also been sealed off by police, with bomb disposal vans pictured close to the incident.

DWP shares real-time monitoring of methane levels at the station in an online dashboard, which has shown no leaks since modified packing seals were installed in December 2020, the spokesperson said.

The answer being pursued by many governments is geological disposal - burying the waste in sealed tunnels deep underground.

A dejected Boulter looked on from the sidelines as Slovakia broke again before serving out the win that sealed a spot in their first final since they won the tournament in 2002.