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Two US astronauts whipped through a third spacewalk outside the International Space Station to rig parking spots for new commercial space taxis. RAW VISION.

Miami:Two US astronauts on Sunday made speedy work of their third spacewalk to get the International Space Station ready for the arrival of more commercial spacecraft in the coming years.

Tethered to the outside of the orbiting outpost, space station commander Barry Wilmore and flight engineer Terry Virts reported no problems with their spacesuits during the outing, but Mr Virts discovered a small amount of water building up in his helmet after he re-entered the space station.

A similar problem occurred after Wednesday's spacewalk, when about three inches of water collected in Mr Virts' headpiece, but NASA said the problem did not put the astronauts in danger.

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US astronauts spacewalk to prepare ISS for commercial spacecraft