This is the Global News Podcast from the BBC World Service.

I'm Nick Miles, and in the early hours of Thursday,

the 22nd of June, these are our main stories.

The search for a missing tourist submarine in the North Atlantic is widening,

as estimates suggest those on board could run out of oxygen in the coming hours.

The UN Refugee Agency has warned that the Civil War in the west of Sudan

is fast becoming an ethnic conflict.

Lasers have revealed an ancient Mayan city in the heart of the Mexican jungle.

Also in this podcast,

we're all run into this world and sort of immediately indoctrinated and put in a box

and told how we're supposed to be and how we're supposed to act.

A top Hollywood star on gender identity and redefining masculinity.

In the waters off Newfoundland, rescue workers are searching into another evening,

and then on through the night for the tourist submarine Titan that's been missing since Sunday.

An international search team has been assembled using specialized planes and boats,

remote controlled robots and sonar listening equipment, which has detected noises under the

water. The five people on board Titan are likely to run out of air in the early hours of Thursday.

Captain Jamie Frederick of the first Coast Guard District gave an update from Boston in the US

on the rescue mission a few hours ago.

Michael Armstrong is a correspondent for CBC News Canada. He's in St John's Newfoundland.

And tell me more about the challenges for rescuers.

It's about 26,000 square kilometers. It is a massive, massive area. The US Coast Guard says it's

...