内容摘要：At the back of the chamber, another large metal box contains GitHub's Code Vault.

At the back of the chamber, another large metal box contains GitHub's Code Vault.

Instead, they have a sharper sense of taste and smell, and sensory organs on their skin help them detect vibrations to navigate the substrate and avoid predators.Their sources of food include only what's available inside the cave, like leaf debris and marine organisms flushed in by seasonal floods, and even bat excreta.

And within this extremely harsh environment, these cave-dwelling fish species live out their lives, some living up to a decade, and even produce offspring.Remarkably, their offspring are born with eyesight - a feature that links them to the surface-dwelling ancestors from which they've evolved - and gradually, they lose their eyesight as they age.But searching for these fish is no easy task.

It involves rappelling down hundreds of meters into cavernous holes in the earth, squeezing through tiny tunnels with little oxygen and wading through pools filled with creatures yet unknown in pitch darkness."Our headlights are the only source of light," Mr Mukhim says.

Catching fish involves squatting near pools for hours, and swiftly sweeping up the skittish creatures in a net as they present themselves.

Mr Mukhim, who has been studying fish found in the caves of Meghalaya for over a decade, says that there's a need to study these species as that is the only way we will be able to conserve them.US District Judge Allison Burroughs indicated Thursday she would later issue a longer-term hold, known as a preliminary injunction, that would stand while the case played out in court. That development would allow international students and faculty to continue studying at Harvard during ongoing litigation.

The legal battle is being closely watched by other US universities and the thousands of foreigners who study at Harvard and around the country.There are two main questions at play in Harvard's lawsuit, lawyers say.

Do the government's reasons for targeting Harvard's participation in the student visa programme hold up under the law?And, are those reasons legitimate, or just a pretext for punishing Harvard for constitutionally protected speech the administration dislikes?