You'd have to really like shipwrecks to like this book. Like the first one, it's a series of NUMA adventures for shipwrecks. Or other lost historical vehicles with some maritime link. This one includes an airplane (trying to claim the Paris - New York prize) and an airship, the Akron, one I've never heard of.
Cussler starts each one with a short story about how the vessel could have been lost. The stories are pretty good, though stuck with matching historical facts, they're not as interesting as the Dirk Pitt adventures. Then the second half of each section describes Numa's search for the vessel, sometimes more than one search.
This book was disappointing in that they didn't find a number of the vessels. It seems from remembering the first one (it's been 4 years), they found most of htose vessels. Here there are lots of disappointments. It is interesting in that there are descriptions of battles, famous figures are involved (Lindburgh, Kennedy) and not all are ships. The airship one is interesting and makes me want to find out more.
Anyway, if you like Cussler's writing, or are interested in shipwrecks, this one might be interesting, but it lacks excitement for the average reader.