Poderia ser o mesmo, como Um velho romance juvenil sobre um pequeno grupo andando pelo Oceano Atlântico congelado? ?
Tempo do Grande Congelamento por Robert Silverberg.
Miles beneath the layer of ice that covered Earth in the New Ice Age of 2300 A.D., men survive in the subterranean cities they built to save themselves as the ice crept with killing cold over all living things. For three hundred years no one has seen the surface or communicated with any other city. Until now. Now the few scientific instruments that remain seem to indicate that the Ice Age may be ending; outside temperatures are reaching a level that may make life possible--though not easy--on the outside. But life in the undergournd (sic) cities is comfortable, and those few who are brave enough to be curious about the unknown frozen world above are suspect; troublemakers. A small party of these "troublemakers," led by Dr. Raymond Barnes, with a few scientists and others who think they might prefer freedom to safety, has been allowed to take the long-unused elevator up through the ice to the outside. But they go more as exiles than as a scientic (sic) expedition; they are not expected--and may not be allowed--to return.
Foi escrito em 1964, o que se encaixa no seu tempo, e envolve um grupo que vem de uma cidade subterrânea para ver se está seguro depois da Era do Gelo.
Termos de pesquisa: adolescentes juvenis emergentes de uma era do gelo (não sei por que pensei "adolescentes" em sua descrição ...)