the blue dolphin looks more like a siezmegraph boat. they use them to look for oil in the gulf. i still remember testing out the air cannons on them .we would have them at the dock and set that thing in the water and every few seconds a huge kaboom would rattle the boat and make a huge mushroom in the water kinda reminded me of watching them old ww2 war videos when they would drop them dept charges overboard to sink them subs.