Could U-boats ambush the damaged fleet on its way home?

Would the damaged British fleet face a logistical disaster or submarine ambush while returning from the Baltic?

Losses would continue, but Germany had only about thirty operational U-boats through much of 1915, and most enemy naval strength would already have been committed to the main battle.

The first question is what German force would remain available to deliver a decisive second blow. The High Seas Fleet and coastal craft would have thrown themselves into the Baltic battle, leaving few untouched surface units for an ambush. Germany's U-boat arm was also still small in mid-1915, with roughly thirty boats operational and about fifty commissioned across much of the year. That force could sink stragglers or damaged ships but could not reliably destroy the returning Grand Fleet. The North Sea was also a familiar British operating area rather than a remote supply theater dependent on Russian bases. The retreat would be costly, yet the main danger remained the fleet battle itself.