What's the Name of That Book??? discussion

This topic is about
Secret Sea
SOLVED: Children's/YA
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SOLVED. boy & man search for sunken spanish treasure ship [s]
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Unfortunately goodreads doesn't have a summary of this book, and the book is not at my public library.
I read this story so many, many times as a kid! Hope I can find it online somewhere.
Thank you!!

Thank you so much!!!
"Secret Sea — A dying Cuban, terrified by a nameless, sinister "tall one," leaves naval officer Pete Martin a clue to a sunken Spanish treasure ship. — With only a brash waterfront urchin as crew, Pete sets sail in his old schooner, pursued by the "tall one: in a radar-equipped yacht. — Outwitting the enemy in a storm, they find the prize guarded by a monster octopus, and the menacing black yacht again on their trail. "
The man (retired navy guy?) finds a logbook from a sunken spanish treasure ship and goes to search for it. The homeless teen stows away on his sail boat.
Bad guys are searching for the sunken treasure also. They capture the man and teen and torture them with leather bands tied around their wrists. The man is able to release signal flags on the mast of his ship to alert a navy(?) buddy who then rescues them.
There is also an encounter with a giant squid when diving for the sunken treasure ship.
In the end the teen uses some money from the treasure to buy a bicycle like he had always wanted as a kid. He rides it once and gives it to a boy who looks like he wants a bike as badly as the teen used to.