Would a second ring of sea forts surround Heligoland?

Would a second ring of sea forts be built around Heligoland?

Probably not in this period, although Germany could invest in other weapons and firepower directed at the island.

A viewer proposes extending the contest into a second fortified line around the island. A ring of sea forts does not fit the technology and construction choices of the period under discussion. Germany could still invest heavily in guns and other ways to attack or contain Heligoland, but that is different from building another permanent offshore fortress system. The short exchange separates plausible military adaptation from an especially elaborate engineering response.