sentences:  All of a sudden, a second Loch Ness Monster appears and gives chase to Shaggy and Scooby, but falls into a previously set trap.This monster is revealed to be a huge puppet controlled by the Haggart brothers, and the one Daphne captured is revealed to be a home-made submarine operated by Professor Pembrooke.Pembrooke used a secret entrance in her boat to go into the Loch Ness Monster and operate it.