Phenomenal Japanese wave pool action

Tired of the dismal weather? In Japan, indoor swimming pools are phenomenally popular. This incredible clip shows the  pool at the huge Tokyo Summerland theme park on a recent holiday weekend. 23,000 people turned up to swim, paying up to £20 each. At 3pm, they turned on the wave machine and this happened...

(via Trends in Japan with more on Tokyo indoor pools at News on Japan and there's a great picture series at Theme Park Review)