The trench keeps filling with warm coins

I'm standing in the trench again and the water is rising past my boots, and the coins are warm like they've been held all day. I try to log each one but my hands won't close around them — they slip through and I can hear the water climbing the trowel. Every night the sequence runs a little longer before I wake. Thought I was documenting it. Turns out it's been documenting me.