Large as a pine tree top,Blue and red tube shaped colored lights running from top point and bottom point to circumference center.

Descending slow and stead, first thought, a helicopter coming over the tree topped hill from the local hospital but it made no sounds. Moved along about 60’ in the air shinning a strong light down below the surface of the water flying around Eagle Island across the Merrimack River. The tubular red and blue lights outlined from the top and bottom joining in the middle but you could still see threw them front to back and the inside was hazy. I couldn’t distinguish any interior form. It moved along the north shore of the river and headed over the marsh area toward Salisbury. Took about 10 minutes. I did not realize at first what I was seeing. Later I thought maybe it’s a drone from the Coast Guard and called them but they said no they don’t use drones on the river. So, guess someone wanted to do some surveillance… who I do not know.