The inquest heard the two women, who were originally from Pakistan, but lived in Rotherham, travelled to the national park with three male friends who were students with them at the University of Chester.
The group had travelled on the Watkin Path, which is one of the main routes to the summit of Wales’ highest mountain Yr Wyddfa, for 40 minutes to the cascading pools, where they decided to split up.
North Wales Police investigator Gutun Lake told the inquest the sisters’ friends said this was to respect the privacy of the women and for religious reasons.
The two sisters, who were studying for masters degrees, headed further up the pools.
But Lake said when it came time to leave, the pair did not respond to repeated calls from their friends.
“They came across Hajra floating face down,” he said.
They managed to pull her from the pool, but were unable to locate her sister.
A local resident came to help and performed CPR until emergency services arrived.
Members of the Llanberis Mountain Rescue Team entered the pool to retrieve Haleema, but both women were pronounced dead at the scene.
A post-mortem examination confirmed they had both drowned.