Radio operations were conceivable.

But reach it no one could.

The adventurer would have been swallowed in mud.
This safe isolation would continue for a couple of hours and then the playful water would come rippling in again spreading a glinting coverlet over the flats once more and lifting the island upon its swelling bosom.
Down the narrowing river rowed our rescuing crew, and as they rowed the river narrowed.

Soon the lantern light on the island was abreast of them, some forty or fifty feet distant.
"Hello, over there," called Warde.
"I'm pretty well," called Pee-wee.
"What are we going to do ?" asked Townsend.

"The tide has beat us to it.