By Hamish Cardwell, RNZ 
Exhausted bureaucrats are locked in all-night talks at the COP26 climate summit. 
RNZ climate reporter Hamish Cardwell spoke to a COP veteran about the post-deadline after-midnight madness. 
Oil Change International senior campaigner David Tong has been to most COP UN climate meetings in the past decade. 
He said almost all blow through deadlines, like this one did this morning, while negotiators and diplomats scrambled to hash out an agreement. 
All-night talks are currently under way. 
Tong said at this stage of the summit, talks could get very strange. 
"Things get bizarre. In the Durban [COP meeting in 2011] the lead negotiator for Venezuela stood on her chair and banged a high-heeled stiletto shoe on her table saying 'Venezuela ... will ... not ... be ... bribed, Venezuela ... will ... not .... be threatened, Venezuela ... will ... not ... support ... this'. 
"And then three hours later, Venezuela voted in favour." 
Venues start closing and cafeterias are dismantled - negotiators subsist on chocolate and fruit. 
"In Durban, I was standing in a queue at the last cafeteria that was open behind a man, I don't know where he was from but he must have been French. 
"Because when they said that the cafeteria had run out of cheese, he said 'but what am I to have with my wine?!'" 
This tweet shows how far past the Friday end-of-business-day deadline previous COPs have gone before an agreement is reached. 
Tong said in Madrid in 2019, a comic convention was held in the other half of the conference centre on the last weekend. 
"So you had these incredibly tired negotiators and diplomats walking out through full military security to be surrounded by Madrid Spanish comic fans dressed as superheroes. 
"It gets incredibly strange." 
Post-deadline decisions almost certainly worse for the environment 
Back in the negotiation rooms, key diplomats form huddles, while the Presidency (the country hosting the meeting) pulls countries who are at loggerheads behind closed doors to hash it out. 
Tong said New Zealand's Climate Minister James Shaw - who is co-leading talks on transparency, essentially how to verify countries are making the emissions cuts or financial contributions they claim - will be scrambling to help the Presidency to get consensus. 
He said several negotiators would fall asleep in their chairs. 
And there would be lots of empty chairs because negotiators, particularly from poorer countries with smaller teams and fewer resources, had to catch flights home. 
"An adviser from one of the Pacific countries told me ... whatever is agreed on the Friday you should stick with on the Saturday. 
"Because it only ever gets worse on Saturday because the voices of small countries are no longer represented." 
He said while post-deadline sees the compromises struck which allows the final agreement to happen, it almost always leads to worse environmental outcomes than where things stood before the deadline. 
"[It is] negotiation by attrition."