The stretch of golf-ball-size pumice rocks was first spotted this week by a New Zealand air force plane about 1,000 kilometers (620 miles) northeast of Auckland. The rocks stretch for about 26,000 square kilometers (10,000 square miles).
A navy ship took scientists to the rocks on Thursday night. Naval Lt. Tim Oscar says the rocks appeared a brilliant white under a spotlight, like a giant ice shelf.
He says it’s the “weirdest thing” he’s seen in 18 years at sea.
Scientists say the rocks likely spewed up in an eruption by an underwater volcano. They don’t believe the eruption is connected to the onshore ash eruption this week of another volcano, Mount Tongariro.
Officials say the small rocks pose no danger to shipping.
The Defence Force says the mass of rocks stretches 250 nautical miles by 30 nautical miles.
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