[corkoman]

The 777 is a plastic/carbon fiber airplane with a little aluminum. It is not magnetic nor good at reflecting much energy back at a radar/sonar source. Resting in chunks on an ocean floor it's practically invisible.

You are thinking of the 787.

This 777 is a big flying chunk of aluminum and most of it will sink PDQ.

[mad_as_he$$]

In addition, the fourth-generation 777X composite wing has a longer span than today’s 777. Its folding, raked wingtip and optimized span deliver greater efficiency, significant fuel savings and complete airport gate compatibility.

http://www.boeing.com/boeing/commercial/777X/