Kristina and Yuri Osipovi, from St Petersburg (Picture: East2West News)

A woman has vanished in underwater caves in Egypt after diving ‘too deep’ to 400ft with her husband.

Kristina and Yuri Osipovi, from St Petersburg, Russia, were part of a tourist group exploring Giftun Island, south of Hurghada resort.

It is understood the couple were already at 120ft when they decided to go deeper ‘without any special equipment’.

Yuri, 41, aborted his dive after beginning to lose consciousness, and resurfaced to the top. But there was no sign of his wife.

A search is underway for the mum-of-four and the area has been expanded, but rescuers are losing hope they may find her.

Russian Consulate General diplomat Alexei Zhilyaev said: ‘After the husband’s ascent, the computer showed a maximum depth of 400ft, that is, this is the depth at which they were and both lost consciousness.

‘When her husband surfaced and regained consciousness, his wife was not around.’

Rescue ship commander Mustafa Nabil told REN TV her body may not be found if carried away by a strong undercurrent.

‘Her husband said he began to lose consciousness, what we call nitrogen narcosis, which makes divers feel intoxicated while diving,’ said Nabil.

But the man managed to swim out, while Kristina remained in the water.

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It is believed the couple decided to go deeper ‘without any special equipment’.