Hardly anyone else did; the pool was nearly empty. 500 m in about 11 min, then 3 x 50 m on 75 seconds. Core work in dive tank. Elbow work in hot tub.
The 500 m was good though my arm was hurting a bit at the end. The 3 intervals nearly killed me trying to get them done quicker than a minute. I've got a long way to go.