I'd have to agree with Danny..Mahogany
There's at least five species across the globe called "mahogany". Not to forget all kinds of local woods with vernacular names including the term "mahogany". There is no single mahogany species. So what species are you saying it is?
The color is off for the true mahoganies
Swietenia. It resembles Khaya mahogany just a little bit. But the main thing: measured SG was over 0,80. No way this is 'mahogany', just for that single reason! Please don't create confusion by just yelling "Mahogany!" to every reddish-brown tropical wood you see.
I agree with Mike. Azobé (
Lophira alata) fits the story and the pictures perfectly. Found in marine environment, high SG, accurate color, the grain matches the pics, interlocked grain...