The "steam" comes from the diesel outboard exhaust valve spray ring. This thing sprays sea water onto the outboard exhaust valve seats to keep them from pitting or warping from the exhaust gas heat.
The hydrogen comes out aft, defused through an aux sea water discharge. The CO2 from the scrubbers also comes out there as well.
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Neptunus Rex sends
"In the spirit of reaching across the aisle, we owe it to the Democrats to show their president the exact same kind of respect and loyalty that they have shown our recent Republican president." A.C. 11-5-08 
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