Yes, I loved that story about the Panama Canal! I have heard Sandra several times. She is very knowledgeable and knows her stuff well! She does not have the spunkyness that Terry has. Terry is so animated and keeps the audience's attention like no other I've ever seen! Terry is also very approachable anytime you see her around the ship and easily becomes a "friend". In fact, we had a big 60th birthday party in Houston in April for a dear friend (Hans) and it was a special treat that Terry flew in just for the party.
I can't say anything against Sandra, she's very very good and very nice but just a different personality than Terry.