waiting for the tide

We've had a busy day, repairing two ribs near the stern (back of the boat)
dad had cut away the old timber last time he was here, so we could get on with fitting new wood today.
In the photo I'm doing a spot of upside down hammering, driving home a copper nail, which fastens the planks of the hull to the new piece of timber. We had to wait for the tide to go out to do this, as the nails were below the waterline!